I currently pay £4.42 per 1000l for a normal mains piped water supply (and for the drainage system to take that water away again). 1000 gallons is 4546l, so th

I currently pay £4.42 per 1000l for a normal mains piped water supply (and for the drainage system to take that water away again). 1000 gallons is 4546l, so the cost for desalination is £0.86 for 1000l by your price. Sounds like desalination is worth it even in soggy England (which hasn't been soggy at all until a few days ago).