In reply to domwhyte:
Well, a Terra Nova Quasar, or variant thereof, is the standard answer, but that may be too expensive; a Macpac Olympus is a tunnel tent and may also be too pricey (I guess, haven't checked). A Vango Nemesis is cheaper, but maybe too heavy. A Robens Lodge may not be sufficient for the conditions.
So, compromise may be the thing. Have you looked on ebay?
T.