We have just picked up a Quechua Family 4.2 XL pop up at Decathlon Lakeside for �114.99 (reduced from �199 I think). I suspect they are going to be discontinued for this season - Decathlon seem to have been reducing their family pop up range for some reason, possibly to focus on inflatables. Or maybe they will bring out some new family pop ups in the Spring - who knows?
Anywat, the two vis a vis bedrooms in the 4.2XL are 160cm wide so big enough for a large double/kingsize airbed and easily big enough for a family of four. The living space is 5.9m sqaure, so not gigantic but fine for a long weekend, particularly if you add an awning as a porch area.
For anyone thinking of getting a pop up, these are a good option for a family. They are out of stock online but if you have a Decathlon near you it might be worth popping in for one.