Not an independant but have always have had mine serviced at Holdcroft Nissan in Hanley and have never been able to fault them. P1 should be cheap as chips from there anyway.
I was there diving 2 weeks ago and spotted a black 370, believe me the roads are atrocious.
This one?
viewtopic.php?f=18&t=40725&p=604473&hilit=malta#p604473