If it's a decent tent your after may i suggest you don't buy one from teco/asda/lidl they are cheap for a reason and that is because the materials they use are very basic. For instance the fabric has a very low hydrostatic head value, i.e they let the rain in if it rains to hard and the seams are not sealed very well.
Don't get me wrong they are a bargain for festivals or one offs but if your looking for a tent to last then you should pop along to Blacks or some where and see what they have. Some thing like this is a good buy
http://www.blacks.co.uk/Tents-and-Ca...ct/095640.aspx