I am after recommendations for a 4-person tent, 3-seasons, for myself, my husband and my 2 kids (3 and 5). We already have a good lightweight 2-person tent, which will be great for when the kids get a bit bigger, but until then they still all seem to end up in our Queen size bed each night!!

ETA:
A further question. Does anyone have any experience with Bivy Bags and kids? It is something I have always been keen to try, and although more expensive, it has the bonus of being useful as they get bigger, maybe a couple of bivvy bags combined with our current 2-man tent.