Mr + Mrs Oxy did it in 2007, I did it in 08 (along with Little Miss Happy). The swim is seriously murky (no viz at all going round the buoys) and its in a fishing lake. Loong run across a field to get to T1, bike course has a couple of cheeky upflats, but I do note that they are changing the course for next year. The run is all in the grounds of he castle so minimal traffic to worry about, its a sort of cloverleaf shape, the rise up to the castle will have you puffing a bit, that aside its scenic and fairly well shaded if it happens to be warm.
They offered the option of camping in the grounds, but the only facility is a cold water tap (and the portaloos in transition) so only really an option for the hardcore.