Comment by Ray20

> Also commercial water rates appear to be about £2.50 / cubic meter.

I even became interested in how much energy is needed to desalinate water by boiling it, taking into account recuperation and everything else.

> Desalination depends on electricity prices, which are fairly high in the UK at the moment.

Electricity prices are largely dependent on the need to deliver a steady flow of energy and store it, which are not a concern in the context of desalination water.