it was probably raining. i can say that with some authority, having not been alive then. but hey it's northern ireland.
actually london probably is fairly humid. i was maybe more thinking of the south coast which was less so.
EDIT: i'm just pissed off with our weather, in case you guys think i'm annoyed with you, i'm not, lol. But we had the same complete shite weather you had from april through mid-july (i think only wales had it worse), but you've had good weather the past week. it's still been raining here. yesterday late afternoon/evening was nice, and parts of today were decent (though it rained today too), but that's about it.