I`m in Surrey but at the time I did the build on my Vitesse engine, a well known Triumph man was working at Maynards so he did my engine, I went back to them for my Herald 1500 engine as I liked the guys there and trusted them. Martin did the tuning. Alex now runs it after he took over from Mark Maynard.
On the Jet, anti clock makes it richer, unless it`s a left hand thread. Haynes is correct, down for richer-up for leaner?. I always start at 2.5 full turns down from the bridge and go from there.
Steve