Hi Andrew,
Oh no! The builder is fleecing me as it is - £73 for the tap and £65 for the socket ! I don't know how much he would charge for a drain!
I am going to have a water softener fitted for the house water,which I think works by DI, but I read somewhere it is possible to have an RO system- is there any way I can combine the two?
Here's hoping,
Glen