That was the Wembley Pavillion I believe; a circus tent that they were using whilst the Wembley site was re-developed; I believe all has returned to normal now. It's too popular a venue / are to ignore completely on a UK tour.
Indeed, the tent was truely dreadful, these days the arena has been refurbished and is indeed better than before... however the sound quality is only marginally better.
Still that being said I booked my tickets as soon as Jackie let me know it was up, so fingers crossed for a good seat!
THe 'new' Wembley Arena is a joke. Great work done outside with a fountain etc... great work inside to the cafe areas, entry doors etc... BUT where it matters most - ie the actually playing arena - they haven't done anything; still the old concrete steps, shitty old seata, and no sound improvements