Thanks for the welcome guys.
Smithy, I've only had the SLR for two weeks so only filled it up once. It did 60mpg on the 1st tankful but that was mostly commuting so I expect that to drop off when I get more of a chance to give it the beans! It's a bit snatchy from very low revs (can't be accurate cos there's no Tacho (yet!)) but soon cleans up and pulls very well from a guestimated 3k rpm. It does seem to run out of puff a bit as the revs rise, but again due to the lack of the tacho, I can't be more specific. There is supposed to be an easy baffle removal / re-jetting fix to get back up to nearer the 45bhp the original Dommi's had, so I may well be trying that shortly.