Finally after weeks of agonising and weighing up of pros and cons we have made a decision and bought a tent.
We ended up going for a Royal Avignon 6 after having very nearly picked the Vango Colorado 800DLX. In the end the Royal won as we think (hope) that the living space is more open and airier and nicer to just lounge around in. We have two very small children and felt that from inside the Vango we couldn't see them very well if they were playing outside. I suspect our tent is going to be a bit of a beast to pitch as it is very heavy but hey you can't have everything.
Am praying it will arrive quickly as DH has some time off work next week and we plan to go camping if tent is here. Yippee!! Can't wait.