My mistake - not Comberton but Sawston
I didn't realise that you were relatively local so me otherwise I'd have put the full info up in the first place!
The company is Powder Plu
darren AT powderplus DOT co DOT uk
Their building can be a little tricky to find (or at least I found it so) - it's here
, marked with the green arrow. Basically pull into Sawston Park
, almost immediately turn right to go past the front of unit 9A, then once you're through the gap in the hedge, turn left and follow the road to the end.
You're welcome to nip over and take a look at the frame that they coated for me - I'm based in Fulbourn, so not too far. I could take a look at your frame and give you my opinion too if you'd like, but it'll have to be after the 24th June as I'm off to Le Mans for the 24 hour race in about three hours!!!
Cheers for now...