An update after doing it's first 120 miles:
Initially (first 20 miles) had a few ignition problems when hot and assumed it was the mag, so had the armature re-wound by Paul at APL (just up the road from me). Turned out to be the wrong grade of plugs, so switched from Champion L82C to NGK BP5HS and all my problems went away.
For the last 100 miles:
Starts really easy on the Bi-Starter once you remember not to touch the throttle.
Very powerful with rapid acceleration with those 1000cc and high compression pistons (150 psi on all pistons when hot).
Plugs dry but sooty on nearside and dry and sandy colour on offside; getting better all the time and much less smoke now.
45-50 psi on Oil Pressure gauge, hot and cold, with the Morgo pump and cartridge oil filter kit. Currently on straight 40 but might change to 20/50.
Fairly oil tight.
Fitted the correct high-back saddle but it does push you towards the tank slightly.
Looking forward to the next 100 miles....a photo from yesterday