Fraggle, I'm sure that TVT would be able to organise for you to swim in an outer lane, they certainly seemed very obliging at the tri-a-try.
The big hill is Harts Hill Road which goes from Upper Bucklebury down to Floral Way in Thatcham (by the Mill House pub). It's steep and very twisty. If they keep the same route as last year, you have to come down it, round the roundabout at the bottom then back up.
I haven't tried it yet but would be happy to have a go with you (safety in numbers !)