I'd have a look at the connectors on the stalk assembly as a first step if you haven't already. Given you have 2 faults on separate systems and thats the only common point (not sure on the mk2 if its the same connector for both, but easily checked once you have the covers off). I think others have found there are two fuses for the controls, 20 and 24 are shown by the Haynes manual in the breakdown, the wiring digaram there shows they are the front and rear wiper motors. f27 is also shown but this appears to be the stalk supply, and you'd get no wipers if that was blown.
The wiring colours leaving the switch are shown as Bn/Ye for positive, and Gn/Ye as negative (Bn=Brown,Ye=Yellow Gn=Green), these intersect with the wiper circuit as well. When you pull the control to wash, do the wipers start up on the appropriate screens? If they don't then I'd try a jumper wire between those coloured wires and see what happens (you can use an inline fuse holder for this task if you want to play it safe doing so with a 5a fuse fitted.
If that works it suggests the stalk is shot. if not and the wipers work I'd suspect the pump is broken (its possible if the reservoir is contaminated for them to get jammed up with slime) or the wiring is broken at some point between the two. If the wipers work when triggered by the wash pull then I'd doubt its the stalk itself (though may be that its not plugged in properly of course or damage to the connector pins)