In reply to Durbs:
I can recommend Outwell tents for family camping (2 adults, 2 young kids). Good quality at a reasonable price, and usually on offer in Go Outdoors.
We have a Montana which I don't think they make anymore, but is a good sized 4/5 man, with big interior area (standing height) and sleeping areas that can be zipped into one large or two separate, and will easily fit double mattress and travel cot.
We use this for car camping with the kids, its about 3/4 years old and going strong, we have had it up in some very strong winds and heavy rain without any leaks or problems.
The Cape Coral seems to be the updated version of this tent, and looks almost identical.
Only issue is its fairly large when packed down (and about 17kg I think), so you wouldn't want to be carrying it any distance.