I paid £36.75 for each of the two tickets I bought for this, plus the £3.95 tx fee, and they are in the stalls as well. You do need to be careful buying tickets at the TRB as there are normally a mixture of prices in each area of the auditorium, sometimes with a fairly dramatic difference in...
Maybe also unliveried as a security thing? There's LOADS of coaches driving around all the time, for all sorts of reasons. A football club's coach if obvious could be a target for the nutters and knuckle draggers.*
* cf Palace fans vandalising their own team's coach.
Is it the corner opposite Churchill Square these days? Looking at the right hand side, is that the start of Dyke Road, as it heads up towards the Seven Dials?
IIRC Izzard was in New York when the vote for who would become the candidate for Brighton Pavilion, took place. Not a great look in terms of commitment...