Vanguard U.K. Long Duration Gilt Index Fund GBP Acc (0P0000SHY8.L) is a passive open-ended investment company that seeks to track the performance of the Bloomberg U.K. Government 15+ Years Float Adjusted Bond Index by investing in a representative sample of its component bonds, with the fund remaining fully invested in U.K. government bonds with maturities exceeding 15 years; top holdings include United Kingdom of Great Britain and Northern Ireland 4.75% (8.86%), 4.375% (7.44%), 3.75% (5.74%), 4.5% (4.94%), and 3.25% (4.83%), representing 31.82% of the portfolio and comprising 100% U.K. bonds. The accumulation share class, with ISIN GB00B4M89245, features an ongoing charge of 0.12%, daily pricing in GBP, and eligibility for UK ISAs, targeting institutional and retail investors in the GBP Government Bond sector. Launched on 3 February 2011 and domiciled in the United Kingdom, the fund is managed by Vanguard Investments UK, Limited, headquartered at 4th Floor, The Walbrook Building, 25 Walbrook, London EC4N 8AF, with total assets under management of approximately GBP 862.94 million and share class size of GBP 449.52 million as of December 2025. Recent operational enhancements by Vanguard include ongoing charge reductions across multiple U.K. fixed income funds effective 1 July 2025 to enhance investor value, alongside the launch of complementary products such as the Vanguard U.K. Short-Term Gilt Index Fund in June 2025, expanding the provider's suite of U.K. government bond offerings spanning short-, medium-, and long-duration exposures. The fund operates primarily in the United Kingdom market, available for sale domestically, with no reported acquisitions, partnerships, or strategic shifts specific to this vehicle in the last 1-2 years.