Water pump oil leak

Hi guys,

Thought i'd cracked the oil leak on the cat (or rather, the garage did), however, it seems it's still there.
Decided to give the bike a run with the side fairings removed so I could see better where it was coming from, without the fairings redirecting the oil flow. It would seem to be coming from the seal between the water pump and the engine.
Has anyone had any experience with this? I assume there's oil on the engine side of the seal. Is is a simple job to change the seal?

Gary.