So AT LAST we have made a decision and got ourselves an ex-display Montana 6 with the front extension, carpet, groundsheet - all for a bargain price. It has only been used for a few days at a show apparently and looks in pretty good nick.
The BEST part is, we laid it out on the lawn (as too big to put up in our garden) and we can see that it has a kids room inner tent in it too - WOO HOO! The boys will be soooo happy