Paul Corfield wrote:
Ramps on London buses are nearly always at the centre doors [1] and are
powered.

About a month ago, I was waiting for a 521 at London Bridge station along with
a few others, including a young chap in a wheelchair. When the bus arrived,
the driver did his best to get the ramp out to the kerb, but it kept
slipping off because the bendy bus was too unwieldy for him to be able to
get it close enough to the slightly curved kerb.

In the end, a couple of other passengers helped the chap out by carrying him
(in his chair) onto the bus. (The driver was just getting out of his cab as
this happened, presumably to offer similar assistance; it just happened that
others got there first.)

So even when the driver _is_ willing to put quite some effort into extending
the ramp, it seems it's not always possible.

Kake