If the answer is 'yes' then you can make a return journey the same day on the bus for the price of a single! Just show your railcard to the bus driver and he will give you a 'Pay One Way' ticket. So Goring to Wallingford is only £4 return and vice versa!
But the 09.15 and 10.15 Goring to Wallingford services, and the 13.10 and 15.40 Wallingford to Goring services can be a bit busy so this offer is not available on those services.
Any valid railcard can be used to get this offer, including Network Cards which anyone can buy - see the national rail website for details - it could save you a good deal on rail fares too.