The terminology does get confusing. Basically, you have an Oyster card with:
A “7-day Zone 1 & 2 Travelcard” on it. This gives you free travel within Zones 1 & 2 for 7 days. It is worth £33 and it will…
…let you travel as often as you like on bus, Tube, tram, DLR, London Overground and National Rail services within the London travel zones [in this case, zones 1 and 2].
£5 credit which is used when you travel outside of zones 1 and 2, or if you’re still using it after the 7 days are up.
So, when you travelled from Heathrow (which is in Zone 6), you paid from the card’s credit for the stretch of the journey to Zone 2. Now you’re in central London, you get free tube and bus travel within Zone 1 & 2.
Credit:stackoverflow.com‘
4 Mar, 2024
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