I agrre about the argos tent. I purchased one a couple of months ago, and its now seen 12 days use. It's a little cramped, and it pitches inner first, other than that, for £30 it's incredible value. Consider it as halfwat between a hooped bivi, and a proper tent. It's still cheaper than either.
If your friend can stretch to a bit more cash, about £70 - £80, the coleman cobra is a pretty good tent, although heavy. I have one that I've used year in, year out for 3 years, and its a real tough piece of gear. I've painted it with pu sealent twice now....any more and I might make a coracle out of it!
Slightly more expensive, but my real favoroute, is the vaude taurus. Big, fairly light, well made, and a usable porch. I think you can find them for about £100 now