When I buy a return ticket using my PRIV, the difference between a single & return can be as little as 10p. How does it work when using the PRIV NR Only Oyster? Would any return leg that day charge only 10p more? For instance, Greenwich > Dartford return is £1.55 single, £1.65 return. Don’t see the point of PRIV NR Only oyster if it can’t match those fares.