I've just bought a used tent for the series myself.. It is a Lichfield.. Goes up easy n sleeping area can be left engaged for ease of erection(!)the living area is a healthy 2.1m with 1.6m headroom.. This 3 man tent is now available new for around £70 and IMO is worth it...
Most people will make suggestions based on their own experiences, and I'm no different.. As said earlier in the thread, go for one that is bigger than the amount of people who will be using it... So get yourself off to go outdoors, blacks etc n have a look for yourself... I would say however, considering the fickle nature of the English climate, go for a tent that has at least 2000HH(hydrostatic head)rating(the higher the number the more "waterproof" it is...)along with a sewn in ground sheet to the sleeping area at least...
Hope you get sorted...
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Don't believe the hype... Think for yourself.. 
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