In message , David of Broadway
writes

I've read that it's possible to purchase an Oyster-based Travelcard in
advance. For instance, I can buy a 7-day Travelcard effective Sunday
on Friday.

If I were to do that on a brand new Oyster, would the £3 deposit be
waived?

Deposits are no longer required if you purchase a 7-day (or longer)
Travelcard with the Oyster.

--
Paul Terry