Trains to London from here are quite cheap, especially with a rail card as well.
What would be the best day to go to have the best chance of seeing Andy? I never pay attention to how WTF works, is it one match in the morning and one in the afternoon? If so then I guess it's completely random.
Ideally I'd like to see the semi-finals but not sure how easy it would be to get tickets for then.
There is an afternoon session and an evening session each day MH. Each consists of a doubles match followed by a singles match. No telling who will be playing when in the Round Robin stages though. We went two years ago and it was well worth the effort - wish we could go again this year!