Many thanks, Angela, and good morning, everyone. Thank you for joining us today. As ever I'm here with Andy Agg. And once we've been through our respective presentations, we'll of course be very happy to answer your questions. As you know, in May, we updated our strategy, and announced the actions we'd be taking to make National Grid the preeminent pure play networks business. This marked the beginning of an exciting new area of growth with unmatched visibility on around £60 billion of capital investment in our networks over the next five years and clarity on financing well beyond that. Over the last six months, the pace of change in our industry has continued as has the exciting momentum within National Grid. We successfully completed the £7 billion rights issue positioning our balance sheet to deliver this growth at pace. We're delivering on our major capital projects increasing investment to a record £4.6 billion in the first half. In the U.K. construction is already underway on five of our ASTI projects. And in the U.S. regulated CapEx increased 20% year-on-year as we've continued our $4 billion upstate upgrade program. And our policy agendas continue to move forward as well. We're encouraged by the start the new U.K. government has made against their energy priorities. As you would have seen the National Energy System Operator, or NESO was established on the first of October following our sale of the Electricity System Operator to £613 million. They've also formed mission control to help accelerate progress on energy projects needed for 2030. And at the end of this year they will settle their action plan to achieve this taking into account the advice set out this week by the NESO. The NESO's report is a welcome milestone towards clarity on the steps needed to deliver against this goal and we'll continue to play our part alongside the government regulator and industry. The government has also commissioned NESO to develop a strategic spatial energy plan setting out where energy assets need to be built and when to meet the country's 2015 net zero goals. We're pleased that the King's speech in July include the expected legislation to reform the planning system. This will help to accelerate the delivery of critical infrastructure something that we've long been advocating for. In the U.S. Massachusetts and New York policymakers are continuing to progress plans to align economic growth and system reliability needs with their clean energy and climate goals. Both states recognize the need for long-term holistic energy planning and we're encouraged that this is now underway. From a regulatory perspective, we've agreed new rates for our downstate New York gas business and for our Massachusetts electric business giving us even greater visibility on our investment plans. And in the U.K. Ofgem's publication of the sector-specific methodology decision mark the next step in the RIIO-T3 regulatory process. We've also achieved another important strategic milestone by completing in September the sale of our final 20% stake in our U.K. gas transmission business for £686 million. So as I say, exciting momentum and progress in the last six months that underpins our compelling investor proposition of delivering low-risk high-quality asset growth, strong earnings growth and an inflation protected dividend. Now turning to our financial performance for the first six months. On an underlying basis that is excluding the impact of timing and exceptional items, operating profit from continuing operations was £2 billion, 15% higher compared to the prior year at constant currency. This reflects good performance across all of our regulated businesses, which drove an increase in underlying earnings per share of 8% to 28.1p. Our business delivered a record £4.6 billion of investment, up 19% year-on-year at constant currency. And in line with our policy the Board has declared an interim dividend of 15.84p per share. Turning next to reliability and safety. Reliability remains strong across our U.K. and U.S. networks despite severe weather in most jurisdictions. Our teams restored outages rapidly and well within regulatory requirements, including in our New York region where during the most significant storms the average time to restore 95% of customers was just 12 hours. As we look ahead, NESO recently published its winter outlook report for the UK in which they're forecasting an electricity capacity margin of 8.8%, slightly higher than last year's and broadly in line with recent winters. Overall, we are confident in delivering our usual high standard reliability across our networks in the months ahead, and remain vigilant as we move through the winter in both the UK and the US. Safety as always remains a critical focus across the business. In the first six months, our Lost Time Injury Frequency rate Was 0.1 in line with our group target. With our significant increase in capital delivery, we are recruiting new contractors working for National Grid for the first time and so we've reinforced our protocols to ensure that our high safety standards are maintained. Now moving to our operating performance across the group starting with the UK electricity distribution. Capital investment increased by 6% to £647 million driven by increased customer connections asset health workload and network reinforcements. We've also made further progress to improve our customer service including in May when we launched ClearView Connect. This online tool provides visibility of grid supply point capacity, including a view of the generation connections pipeline to help prospective developers identify the quickest and cheapest connection points. And we've made good progress in reforming the connections process. By playing a leading role in the industry's technical limits initiative, we've been able to accelerate the connection offer date on over 280 megawatts of distribution generation. And as mentioned, at our Connections investor event in January, by reviewing projects that aren't progressing, we've been able to remove 3.7 gigawatts of capacity from the contracted connections queue. Looking ahead, whilst we're still more than three years remaining in ED2, we're already thinking about the next regulatory cycle. Yesterday, Ofgem issued its framework consultation which includes wide-ranging questions to help shape the ED3 price control and will respond early in the new year. Turning to UK Electricity Transmission where CapEx increased by 43% to £1.3 billion driven by an increase in customer connections with 2.3 gigawatts of new customer connections in the first half. And good progress on our £1 billion London Power Tunnels project where we successfully energized a 2.5-kilometer circuit between Hurst substation and Crayford. Looking further ahead we're seeing an increase in transmission scale connection requests for data centers that is driving significant investment for new and upgraded substations in the Southeast. On regulatory developments, Ofgem published in July their decision on the sector-specific methodology, marking the next step in the RIIO-T3 regulatory process that will run through to the final determination at the end of 2025. We are pleased to see that the document included our commitment to streamlining the overall framework to enable faster decision making on which projects proceed. Proposals for an advanced procurement mechanism, which enables us to secure supply chain capacity early and the introduction of mechanism similar to the ASTI approach to low funding on projects earlier than historically has been the case. As you'd expect we're engaging constructively with Ofgem as well as wider stakeholders to agree the right regulatory frameworks that delivers a net zero energy system and a fair return. Whilst we are encouraged by Ofgem's inclusion of a cost of equity range of 4.6% to 6.4% the allowed return needs to be at the top end of the range in order to continue to attract sufficient capital to the sector. Ofgem also concluded on its inflation consultation with the introduction of a nominal return on fixed rate debt, which will add better matching of allowances to actual debt costs and faster recovery of cash. On the policy front, we've seen progress on connections reform and I'm pleased that we now have consensus with government of Ofgem and NESO on the steps that need to be taken. In the second half of 2025 NESO is expected to implement reforms where projects must move through a two-stage process based on a combination of project readiness and alignment with the Clean Power Plan. Turning next to our strategic infrastructure business created last year to deliver the 17 ASTI projects. We're managing these projects in distinct waves. Wave one comprises the six most advanced projects and Wave two comprises the remaining land which are at earlier stages of development. We're well progressed with obtaining the required consents for the first wave of projects and we expect to have all the key equipment and material contracts in place by early next year. As I mentioned earlier, construction has started on five of the first wave including the offshore EGL Eastern Green Links 1 and 2, Yorkshire Green, North London Reinforcement and Bramford to Twinstead. With construction due to start shortly on the Grain to Tilbury project at the end of this fiscal year, we'll have broken ground in all six well Wave 1 projects. Turning to our Wave 2 projects, we had a number of public consultations running over the summer. And with further consultations planned in 2025, we're progressing well through the consenting process. We're making good progress on procurement and are well advanced in securing the supply chain and we're submitting early construction funding request to Ofgem on Eastern Green Links 3 and 4 in our sealing project to allow these projects to move forward at pace. Coming to the US and starting with New York. CapEx has continued to be strong increasing 29% to £1.6 billion in the first half. This reflects strong progress with our $4 billion upstate upgrade including our Smart Path Connect project which has reached the halfway point in construction well ahead of schedule. And the work approved under the Climate Leadership and Communities Protection Act, where construction on Phase 1 of the project is progressing well and we've just issued the procurement tenders for Phase 2. We've also increased investment in our gas network, replacing a further 161 miles of leak-prone pipe, as we continue to reduce our methane emissions. On the regulatory front in August our three-year rate case settlement for our KEDNY and KEDLI gas distribution businesses was approved by the commission. We expect to invest $5 billion over the next three years with an improved ROE of 9.35%. And we filed for new rates in our Niagara Mohawk business in Upstate New York. The filing proposes transmission investment to integrate renewables, line and substation upgrades and further investment in our leak-prone pipe replacement program. At the end of September as usual the PSC staff provided a rebuttal testimony including a 9.5% cost of equity against our current allowed return of 9% and smaller increases to our allowed – our proposed capital investment. The filing will now continue to progress as we enter settlement negotiations and we're confident we can reach a constructive outcome by the spring. Turning to policy. We're in July, a draft report from the New York PSC acknowledged for the first time that New York State is likely to miss its target of 70% renewable generation by 2030. In response to the report Governor Hochul administration has taken several actions including reconvening the state energy planning Board to draft road map for the state to build a clean energy system for New York taking into account resource adequacy and affordability. As a result a more pragmatic dialogue has opened up. And as you'd expect, we're engaged in supporting the process, which provides an opportunity to shape a more balanced approach to the energy transition. In New England capital investment increased by 7% to £814 million. This largely reflects the continued steady growth delivered through investment in grid modernization and asset health work and leak-prone pipe replacement activity. From a regulatory perspective, in September the DPU issued its rate case order for Massachusetts Electric business, approving a five-year plan with a revenue increase of around $100 million. The order includes a new regulatory recovery mechanism that provides timely funding for growing capital investment and updated performance-based rate mechanism providing inflation protection for operating and maintenance costs and increased allowances to cover the increase in cost of storms. Taken together, these enhanced recovery mechanisms will enable us to earn closer to a low return of 9.35%. The DPU has also approved our electric sector modernization plan as a strategic road map to support decarbonization investments. As part of this we filed for $2 billion of investment including upgraded power lines, transformers, substations and technology platforms over the next five years. We expect to propose costs and recovery mechanisms will be agreed ahead of the program starting next summer. And over the past summer Governor Healey's administration has been working to pass comprehensive energy and climate legislation. The proposed bill addresses critical issues we've been advocating for including setting out an accelerated time line for siting and permitting of clean energy infrastructure projects and we're hopeful it will progress before the end of the year. And finally in National Grid Ventures, capital investment was 11% lower at £279 million following completion of the Viking Link to Denmark last year partially offset by increased investment in National Renewables and the Isle of Grain. We've made good progress on the Propel transmission project through our New York Transco joint venture which will help to deliver offshore wind power from Long Island to the Bronx n New York City and Westchester County. We've made further progress in the fourth phase of the expansion of our Isle of Grain LNG facility which remains on track for completion next summer. And we've also commenced the sale process for National Grid Renewables. So as I said at the start we've achieved significant progress across all areas of the business in the first half as we continue to support and invest in the energy transition. Let me stop there and hand over to Andy to walk through the numbers before I come back to talk about priorities for the second half. Andy?