Buying expedition = car.
Viewing expedition = train.
Car = freedom of arrival and departure, but car parks are pricey, on top of the ticket for those paying for a ticket.
Train = No motorway stress, especially in the wet, but price of train ticket to find, and you're governed by the train's timetable.
I'm still considering whether to go or not, but will probably take the car - just not sure if I can face the rucksacks, and the soap dodgers when we get there <- which was a paraphrasing of an opinion my wife expressed when I broached the subject with her
-Rob