So my XF Diff is leaking!

[GolfyG]

So had the XFs in getting the rear diff checked today. Last month I reported that I heard a low drone from the rear when I hit 90mph under load then it would disappear. On inspection the diff looked damp so booked it in to our local garage. 

They got it on the ramp and agreed it was leaking from the front Oil seal. But sadly they don't fancy the job of reconditioning with new seals, they said if I can locate a diff they will will replace no problem. 

So now I am a little stuck, I need to find a shop that will do the job or find another Diff. Anyone had a similar experience, any ideas of the costs involved with this???? I am based in Dunbar Scotland if anyone knows anywhere in the East that can help.

Cheers

Greg