Badly designed system
Obviously not a well thought out system!
The article mentions you can put a Two together discount on the Oyster card which intrigued me but checking their official site (twotogether-railcard.co.uk) it says you cannot use this discount for London Oyster fares in London, which I thought was the only place Oyster cards worked?
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Your Two Together Railcard discount WON'T apply to:
Season tickets, including Travelcard Season tickets
Oyster pay as you go fares in London
Eurostar tickets
Tickets for special excursions or Charter trains and some coach/bus links, including Railair services
Rail/sea journeys to Calais, Ireland, Northern Ireland and the Isle of Man
Most London Underground and Docklands Light Railway ticket