Just having a look over the Wags, binned the aftermarket washer bag, that wasn't wired up yet anyway, 
it seems the old girl doesn't have any washers wiring.. none up under where the switch lives, and none out near the Kangas sack... 
cant say i've ever seen that before.... anyone else got any ideas? 
I'll just run my own, just seems a bit odd, 
 
I did find two longish wires taped up to the harness near the switch, one comes alive (green) when you turn the parkers on, the other I'm guessing is an earth (black).. 
(nb, i havent investigatd too hard yet, it's late and i was just having a quick look... so could be alive with headlights etc too... )

Yep
Hand pump the sack on early girls

Check middle of firewall from engine bay, behind rear of engine where the washer hose runs. I remember having some random wiring tucked up there.