Three adults (one is 19) and one child (15) arriving LHR T3 at 1510 on a Thursday. Going to Crowne Plaza the City at 19 New Bridge St. via tube. Same night we will take tube from Blackfriars tube station to Victoria tube station and return. We do not plan any other tube or bus travel while in London. We cannot use 2for1 offers.
I assume we should purchase oyster for the 3 adults and one day travelcard for the 15 year old. Is this correct? How much money do you think we should load on the oyster cards?