Well done to all the bands for putting on such good shows at last weekends lower section finals in a venue that was never designed to be a concert hall. It is a Conference Centre, the name sort of gives it away... It may be an excellent venue for the organisers but not for performers. It was designed to be dead, thats what all the carpet and sound insulation boards are for. The only music that works in there is amplified, and before anyone says 'yes but orchestras play there', yes they do and they hate it!
Brass banding had the perfect set up for years: All in London, on the same day, all sections within an easy walk and a certain audience for the Gala concert at night. This only changed because petty parochial little band officials wanted to bring the event out of London. Go back to the winning formula and stop bands playing in empty halls with dire accoustics.