In message , Clive
writes

In message , Paul Terry
writes

Still cheaper than using an Oyster.

Is your personal Oyster not capped?

You cannot use pre-pay Oyster on South-West Trains (or on most other
National Rail services in London), so the only part of the journey
covered by Oyster is the bus and tube journeys. That comes to £5.90,
which is well below the £8 cap for peak-time travel in both Zones 1-4.

--
Paul Terry