The bill came to £1182.01 - About a hundred odd for minor service ( oil, filter etc.) and £873.82 for fixing the seal. Items on the bill as follows:
Flange 69.23
Bolt x6 9.36
Sealant 24.43
Labour 765.04
and a few bits and bobs (nuts n bolts) totalled £873.82
Major disappointment for a 51k vehicle. Still, I get a whopping 12 months guarantee on the new seal!