Hi Gromit -
I've been to a couple of things there. We were on the top level central to the stage. It was a nice view but I wished I'd been able to book central ground floor so I could see the artists closer. www.bridgewater-hall.co.uk You probably had that already. Click on 'about the hall' then site map, then s for seating plan ect.. If you can, I would say buy as close to the stage, central ground floor xxx