Malmesbury Abbey is nice, lived in the town until I was 16. Also, walking the old railway routes from the station yard to Dauntsy as a kid etc brings back memories (one for Reg).
I've visited Malmesbury Abbey lots of times, but on my last visit about 4 years ago, I discovered a little hidden away room up some stairs which contain all sorts of interesting stuff.
Not sure why I'd never seen it before.
As for the branch, it had 2 points, one where it left the Bristol Line and the other the South Wales Line...the track from the Bristol Line closed very early on, probably in the 40's..leaving Great Somerford high and dry. Never explored what's left railway wise around there.