noticed you are based in berks as well.
A few meets coming up so hope to see you there.
2 at idle seems fine and then it does rise dramatically under driving. If it goes below 2 then you might have crank trouble?? not sure and you should ask a tuner like Abbey.
Motorway cruising is like 3.5-4 and then up to 6 if you are giving it beans. I am sure there are people here who have found more!!