I'm thinking of purchasing an OYSTER CARD in order to get into London (King's Cross). After that, I was thinking of purchasing a 7DAY Travel Card (Zone 1 & 2) to use for my general sightseeing. I will then use the OYSTER CARD again for a return trip to Watford Junction, Richmond, and the return trip to Heathrow. Is this a good plan?
Also, there are three of us travelling. Do we need three OYSTER CARDS or can we share on one card?