Reservoirs. We gave up building them in the early 1990s. Great to hear @Keir_Starmer raise on of my favourite symbols of Britain's low investment disease - here's the relevant section of Great Britain? https://www.penguin.co.uk/books/461720/great-britain-by-bell-torsten/9781847928146
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Now: Gilts are just an interest bearing savings account at BofE
Maybe if the planning process of big infrastructure schemes was easier and cheaper?