I live in a two-storey terraced house, it seems pretty simple to add a buffer tank to gravity feed the toilet cistern from the roof gutter. Presumably it's not cost effective or countries with nationalised water would be doing that already? Maybe they are??
Not from the roof gutter, but check what Australia is doing. In new builds, I believe water collection tanks are mandatory now. You can use that for the garden, flushing, washing, etc. The usual system is described at https://www.yourhome.gov.au/water/rainwater but I'm sure you'll find many similar ones. Some could be adapted to use in the UK at small scale.
Any good kits for this in the UK?
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