Martin, as I read it you can’t tell from the meter number whether it’s E7 or E10. Indeed my E10 meter is profile class2, E7. 
Now there may be a way of telling that isn’t documented where I can find it, or another completely separate database. Someone from the industry would know. So on the face of it you probably could get a quote for an E7 tariff as your meter will come up as E7. However you’d almost certainly be breaking Ts & Cs by knowingly giving false information and could end up in hot water. Or cold when they cut you off.