One of the runsoff of fare evasion is that these two-step lifts are
thought necessary.

An in extremis example is at Westminster. There is no lift from the
street to the platforms; that would mean by-passing the ticket gates.
So there is a lift from the street to the ticket office level - one of
the shallowest lifts in London, I would think. It has the depth of
about a dozen steps. There is a similar sort of thing at the Borough
High St exit at London Bridge.

But ISTR that at Stratford there used to be a lift from the street to
either the Central Line or the Docklands, bypassing all the gates.