Thanks Jobbo and Shock. I might plump for the A483 on the way down. I'm leaving in just over an hour so shouldn't get caught up in much traffic (unless anyone knows better). As for point and squirt, it might be more about conservation of momentum in a Mazda 2!
Might try the HOTV on the way back though. Depends on if I want to get to a nice easy motorway quickly or not I suppose.