Would anyone happen to know - and please don't go to a lot of trouble to
find out - which option would be cheaper:

1. Using my Oyster PAYG for everything today, except a single journey from
Victoria to Clapham Junction that I have to do for which I would buy a paper
ticket.

2. Buying a Z1-4 Travelcard and using that all day.

TIA,

Ian

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