Speedline Thames Barge kit.
Going on their advert it looks like an old H.F.M kit brought up to date, I had the H.F.M one back in 1990 that cost me all of £70.00, if I remember right I had to increase the under water size of the rudder.
As for sailing I don't remember much as after a few times out, I found that sail boats just was not my thing.
Sorry that I can not be any more help
Fred