These are not "fiddles" but perfectly legitimate savings, because it is the customer's right to ask for any combination of tickets. However, it is also the clerk's duty not to advertise them, should he or she know they exist.
The only rule connected with the use of such a combination (other than the fact the tickets must be valid, of course) is that the train must stop at the place where the tickets join, although you do not have to alight.A few examples:
You have to leave London for Newcastle on the 0800 train and the open return costs £224. The train calls at Peterborough - and savers to the north from Peterborough are available any train, any day. So book an open return to Peterborough (£68) then a saver from Peterborough to Newcastle (£76.90) - that's £144.90, saving £79.10. Just make sure the train on which you return calls at Peterborough (most do).And another one, exploiting the fact that return tickets to London from Wales can be cheaper than single tickets from Chester (near the Welsh border) to London:
So buy a saver return FROM London TO Shotton and throw away the outward half. You are then "returning", resuming your return journey at Chester. That is all legal. The saver return is £59.70, £29.30 less than the full single.The reasons for this labyrinth of anomalies is a legacy of John Major's privatisation of British Rail, which left the pricing of different journeys along the network in the hands of different companies, thus ensuring that the exact start and endpoints of individual tickets have an arcane, almost alchemical significance.
I wonder how hard it would be to create a search engine for automatically finding optimal combinations of tickets.
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