ZF Gearbox Oil change

[Pooh bore]

Can anyone recommend a service centre for the ZF Gearbox ?

Jag reckons they are sealed for life but maintenance is cheaper than a new gearbox for my XF-S.

Would prefer SE wales or Bristol area but happy to travel for the right place.

[Elesmart]

Andrew Wilson Motors in Dinas Powys is supposed to be a Jag specialist. They have good reviews too. No web page, but they do have a Facebook page.