I am visiting LOndon with my wife on Saturday 22nd August arriving about midday and leaving again about 6PM. We will be travelling by tube from Waterloo to Green Park, then from Green park to Oxford Circus and then from Oxford Circus back to Waterloo.
The one day travel card is £12 each but I have calculated that if I buy 2 Oyster cards, I can do all the journeys for 6.90 each. Is this the best way or is there a cap on Oyster card to prevent me from doing this? Any help much appreciated