Where do XKR engines usually leak oil from?

[dnb]

I have an oil leak from the engine of my MY2000 XKR. I can see evidence of it around the front of the engine, so I suspect the front crank oil seal, but the evidence of oil residue distribution is by no means conclusive proof of this - Where else do they commonly leak from?

I have to replace the SC drive belt & tensioner shortly too, so want to do everything in one hit if possible - it seems daft to take it apart twice because I missed out replacing a £3.50 (if such things exist on a Jaguar ) seal...

Thanks.