Sorry if it has been asked before, but I'm curious to know if this is possible. I am travelling from London to Cambridge, and 2 advance fares from Rugby to Cambridge and then Cambridge to Rugby (via London) works out quite a bit cheaper than an open return ticket from London to Cambridge. The advance fares only impose a time restriction on the Rugby-London train, and don't specify a specific London-Cambridge train, so I'm wondering if that effectively makes it an open ticket?
