Not had a petrol car since 1993 but smell of petrol while running on choke used to be normal, or at least nothing unusual. Same with modern cold start setups?

Bolt probably has explanation but if it keeps on doing it ask the dealer.

Just have a sniff and check round the filler area, in case petrol is being forced back up the vent for some reason, but even the best running cars can still smell a little bit of petrol from exhaust condensation immediately after a cold start, it usually goes within a few seconds though and unless you get a whiff of it, as in reversing, you won't usually notice it.

Some of us have a better sense of smell than others, mine is very keen possibly helped because i never smoked, some Diesel car fumes especially can have me reaching and choking, you might have an equally keen set of nostrils..:-).