After much deliberation and internet searching AND huge help from hmb and JanH - we are now the proud owners of an Outwell Colorado 8 here! (complete with side canopy }
I had to phone round loads of places to get one as its so late in 'the season' but I managed to get one from Cotswold, who had 2 left!!
It's now sitting in it's bag in the corner of the room looking menacing while we try to find someone with a big enough garden to practice putting it up! (a 7m long tent doesn't quite fit into ours!!!)
All being well, we're heading off to Anglesey / Lleyn Peninsula in the next couple of weeks.
So thanks to you both for guiding me through the minefield!!