The grey water problem is that the water in the house is all at the front (except the washing machine, to which I will return), and the bathroom is two floors up, the kitchen one floor. There's a lot of carrying involved as I can't get it down to the garden by hose - did you use grey water for food plants? The washing machine is in a ground floor utility room at the back, and I do think I can possibly get the water out by an alternative to the current system. There's a hole for a tumble drier vent in the door frame, unfortunately low down (though I want to keep the garden mice out). It is further from the machine than the length of the hose, though.

Penny