Actually this is a bit of forward planning on my part. My son is doing bronze (2 day), but is keen to carry on to do his gold, which is the 4 day exped. My younger son is already saying he wants to do D of E too, so I expect the tent will get quite a bit of use.
Thinking about it, given his size - 5'9" and growing rapidly and the team member he is sharing with (about 6'2"), I think I might well go for a 3 man tent. Personally, I prefer a 3 man for two people (unless, of course, you want to cuddle up to the other person...).
Looking around, the Spectre looked a good option, but the entrance is on one side, which I think will be a bit awkward. The Tempest, however, looks a very good option. The 200 can be had cheap as chips if you don't mind 2008 model in "vivid blue". Being a paid up member of the green tents only group, and wanting the 300 version, I'm looking at the 2009 model in pine and black (green and black to those of us that use proper colour names). Quick look around shows I can pick one up for under £100 with a weight of 3.2kg (v 2.55kg for the 200). The larger headroom may also be a very useful addition compared to the 200 (110cm v 85cm according to Vango).
The other option would be to look into Decathlon. I've seen a few people on the continent use their 2 sec tent for hiking (it looks a bit weird strapped to the back), but would it survive a Gold exped on moorland/mountain terrain? I think a trip to Decathlon tomorrow is in order, before I decide.