Autoline in Wigan are pretty good, Alan is a decent fella and won't rip you off. (it's the one on Cricket street im talking about, I have no experience with the one in Pemberton)
Or you can try HB Panelcraft in Preston, not the cheapest but they were the approved Porsche repairer a few years back (probably still are, not been for yrs)
Then there is Karl Vella in Skelmersdale, again not cheap but do a good job.