Hi All, I had both front mag rides repaired by Vasstech automotive in Aylesbury and couldn't be happier.
They sent both off to Nagengast in Poland. It takes about 3 weeks and comes with a 24month warranty, costs £1400 inc.vat.
I got my car back and it drives perfectly.
I wanted to share this with anyone in the UK with leaking mag rides, another option to consider.