In reply to stevedude888:
Depends a bit on what you want...
Wild Country Monsoon might be worth a look - Good deal here:
http://www.sportsdirect.com/wild-country-monsoon-4-tent-783175
Not the biggest, but one of the more waterproof/robust/generally suited to British weather without being exceptionally massive. Sort of a scaled up backpacking tent.
That's fairly lightweight and portable. If weight/size isn't an issue, then there are of options - eg Vango, and the Wild Country tents with steel poles - and you'll get more living/storage space. Go Outdoors website might be as good a starting point as any, though I'd also search eBay for collection only bargains close to you.... our big one was around £50 and in perfect condition.