In message , at
13:24:00 on Sun, 11 Sep 2005, Colin Rosenstiel
remarked:
That's fairly easy - the wheelchair access would be via a new lift
installed in place of the existing ones (on which site would also
presumably be the existing emergency stair exit).

Does the existing lift go from street level to platform level?

It starts at street level, but would probably need extending down a
little to reach the platform. Almost every tube station of that type has
a corridor, then stairs, down to platform level. But this would be
easier than sinking a complete new shaft.
--
Roland Perry