I can meet anywhere in the UK, got the Trainline app, so if I book in advance it wouldn't cost too much.

Really, those train fares in the UK can be quite pricey. I think I spent over £150 on train fares when I went to Nottingham. Without booking in advance of course. Here it's like €20 to travel 300 km and you get a return ticket for that! Yay for government subsidised railways, I guess :P