Whats a respectable lap time for a BEC around combe in the dry on fast road type tyres ?

RGB. Class F are front engined rear drive 1000cc bike engines on road tyres. But obviously they are all very quick drivers!
http://www.750mc.co.uk/formulae/rgb/lap-records.htm

There is a few videos on youtube, one features a very well driven V8 MGB that is in the 1.15 region. Combe favours brute power as there are long straights.

If it were me anywhere between that and 1.20 would be respectable.