Could you daisy chain two quechuas with one of their pop-up living areas? Alternatively, I got an email from Decathlon saying that the Quechua FAMILY 4.2 and 4.2 XL are further on sale this weekend to £119 and £159 for Decathlon family card holders. You could probably just get one on the spot as they are free. But these tents seem significantly bigger than the standard 4.2.
Give them their own tents. A lot of sites will count teenagers as being in 'pup' tents - i.e. sleeping only so you don't need to pay extra pitch fees. Then you have something they can use on their own and you haven't got to pitch something that takes 3 hours!
We've 2 Quechkas, 4.2 and 2.2 but everyone's getting bigger. Can anyone recommend a me a 4 room tent! DH and I a re happy to share, but the pods are too snug for teenagers to share. I'm sure it'll be the last time we can cajole them all camping with us, so it doesn't have to be top notch as well revert to the smaller Quechcas.