Travelling from newport (the nearest major station I found) is the following prices for the cheapest Saver Return fares. Saver Single fares are a quid cheaper than the return

Via Ely - £58.20

Via NOT London - £63.00

Via Chesterfield - £72.40

Via Any Permitted Route - £87.90


They are the cheapest "walk on" fares - but may of gone up by about a tenner or so due to me having last years fare software and not getting an update for it