I'm really pleased with my Equinox bodywork - but collected at the advice of others just in case. I am in Essex - so the distance to AGM was one of the reasons I ruled them out and went with Equinox.
Although, somewhat ironically, AGM does I believe produce GRP for a chap in Essex who builds these:
http://www.furorecars.co.uk/
I think if i'd been closer to Barnsley than Kent I would have gone with AGM myself...