Portal Delta 5 person family tent + other models eg 3 Person £39.95, 4 Person £44.95, 6 Person £89.95

In-Excess Direct have a decent range of Portal Outdoor brand tents at up to half the normal price.

The one pictured is the 5 person Portal Delta but they have various other 2 to 6 person models ranging from £19.95 to £89.95 with £4.95 postage.

Portal is a popular tent brand on Amazon and many of their tents are 4000 hydrostatic head (waterproofness) which is better than the more common 2000HH

Won't list everything here but IMHO best bang for buck would be any of the following:-

Portal Bravo 3 person (blue or green) - £39.95
Portal Bravo 4 person (blue or green) - £44.95
Portal Delta 4 person (blue - much taller & larger porch than Bravo range) - £74.95
Portal Delta 5 person (green) - £79.95
Portal Beta 6 person tent (green - 2 bedrooms and middle living space) - £89.95

Also a good range of other camping items (chairs, tables etc) if you're looking and postage can be combined up to 30kg.