When I moved house a few months ago, my 51" 3D Plasma just fit in the rear of my Dad's A4 saloon (on the rear seats) - That was unboxed, and the stand had to come off (I did have a Luton van too, but wanted the TV to be safe)
I'd be surprised if you could fit it into a Clio (and you don't want to lie it down, the weight of the glass could break)
My advice (if you don't want to wait), rent a transit van (local to me they are £30 for half a day) and collect from store.