Can someone tell me if a typical poptop bay camper will fit into a garage with a height limit of 2.1 metres. (yes, top DOWN just to pre-empt the smart-a's!)

yes, unless it has something higher than the standard pop top

mine fitted in our double garage easy, not sure on height of it tho.

Yes it will fit but only just!

Don't believe the height things at carparks, they lie! I know of one carpark marked 2.0m that I can fit into, and several marked 2.2m that have light fittings, fire sprinklers etc that are too low for me to get under. Believe me, it is a real pain to try to reverse out of a carpark when a queue of traffic has already built up behind you.