It's Relay number 10 under the glove box with the fuses, v easy to replace. I can email the diagram to you if you wish mate.?
? If your wipers won't turn off at all it's more than likely the stalk thats at fault.? Ps, if anyone needs Pdf docs on MK1's? I have a few on alot of area's, not all as good as haynes but some are very handy.
Shaun