Did a quick test yesterday with an old mattress that we need to get rid of, and I'm pleased to say it fitted in the car without causing too much of a visual obstruction! Made me chuckle anyway, I bet all these drivers of soulless estates would be jealous!
Our car has got the 60/40 rear seat split and the passenger table, so in order to get it in you do need to have the table folded down and the main part of the rear bench folded down. Ideally you need the whole rear seat down; I didn't bother with that yesterday as our little boy's car seat was in there.
When we do finally get round to chucking it I'll remember to take a picture for you all!