To be honest i'm looking for a quick way to get there, so as to preserve energy and stay fresh, but it looks like the easiest and cheapest route is an 8hour drive each way!!
The train is the same amount of time, 3 changes including a tube journey, and £170
Flybe to Southampton is £70 each way plus journeys to Bournemouth.
Petrol and a hotel seem to be the best options for me
