So, I gave in and called thew auto electrician. Turns out the elec that did the original wiring did not run it through the fuse box just in case it interfered with the body control module. There was a seperate in line fuse which had blown. Still it took him 25 mins to find it so I didnt end up feeling too bad. He also managed to sort out the wiring of the wiper motor for me. It seems that the terminal which is marked as earth on every diagram I have seen turns out to be the + power terminal (no wonder the fuse blew).
Thanks to those people who helped out
