In reply to Pbob:
I know you said cheap as chips but If your budget can stretch i'd go for a hilleberg, I've got both the namatj 2 gt and 3 gt and can highly recommend them both... There was a 2gt on gumtree not long ago for around the £380 mark!!
There's a review on my blog of both tents and I can vouch for them in all weathers from winter in the gorms to summer in Cornwall (I was probably more uncomfortable in the heat in summer!)
Plenty of room and with the gt models the vestibule is big enough to cook in if your out in a hoolie!
Some others to consider in the second hand market (or new if you get a good deal) mountain hardware trango, marmot alpinst... As others have said alpkit have some good deals at the moment on the kangri or even the bigger zhota
Just my tuppence worth!
Post edited at 21:03