I have just claimed a refund for advanced rail tickets purchased from Greater Angrier. I'm travelling to Nottingham on Monday, and back on Saturday, for a summer school, but the ASLEF people are going to be on strike on the Saturday.
It was a fairly lengthy and convoluted phone call, but it seems that I am going to receive a full refund once I post them to a PO box in Edinburgh (not in East Anglia last time I looked). I had expected hassle of a totally unreasonable type in that they are advance tickets, therefore separate journeys. I expected them to say that my train isn't cancelled on Monday so I just have to suck it up, and they would deduct a £10 fee for the cancellation on Saturday. But apparently not.