I would guess it must be an electrical issue as the wipers have never given any problem before, though saying that never had an electrical problem before either.
The module Harry refers to was replaced for the interior light not working, not the window and was described as for secondary electrics so may well include the wipers. Believe Harry also had an immobiliser/alarm fitted? Doubt the wrap company fiddled with the wipers, though they did put the indicator and brake light lamps on the wrong way round last time they wrapped the car
Hope you get it sorted Harry and as I said let me know!
