Cheers for all the replies guys, i appreciate it.
Chris, got your email mate, thanks. I think im going to kit myself out with a decent roof ladder and some ropes and ook at the softwash equipment a bit later on. Just dont really have the time at the moment to be messing about trying to put something together and test it, and dont really want to pay £500 for a plastic box with a pump inside. But its all given me a bit of food for thought and i wouldnt mind having some kit for the softwashing, so i can offer it to the client as an alternative option.