Just to put into perspective i ran 8:14 BTG in my modded 335i earlier this year on Pilot Cups +. So 8:05 seems very quick for standard power and suspension. Not that i'm claiming to be a particularly great driver.
The cups make a huge difference in grip and confidence. Traffic conditions play a big part in times as well. So i agree unless all cars are run on the same day, conditions and tyres its very hard to compare.
Regardless of the time it's a great value car and i think its sounds quiet nice. I can't really see what else competes @ £30k brand new.
The times stated by Nick the Greek are defiantly full lap times.