Those prices can be insane, although I do wonder how many people actually pay the full price for those premium fares, as opposed to upgrading through frequent flyer miles or similar systems. Also, I seem to remember from the days when I did LON-IAH several times a year that BA had an option below Club class, something like "World Traveller" - a hundred pound premium for some extra legroom, a better seat and better food. Nothing like the extra luxury of the wallet-destroying classes, but a significant improvement from what I saw. (Not that I ever flew in it: I tended to avoid BA because EDI/GLA-LON-IAH was much less pleasant for me than GLA-ORD-IAH. Almost anything beats CDG, of course!)