Thanks guys. It's now booked into RA Body repairs, in Vulcan way as a) they're close and b) they were recommended by a garage mechanic I trust. I'll let you know.
Got it back today. £270 all-in and it looks pretty good. The big guy in charge, John, seemed to know what he was doing - old school, do it right, type of guy. So, unless rust breaks through in the near future, they have my recommendation.