Robert Woolley wrote:

With roll-out of the fully accessible fleet in London, there is a
progressive withdrawal of the Mobility Bus network

Are you sure? UIVMM most of the Mobility Bus network is in the outer
suburbs, with long routes that penetrate into estates that regular
routes do not, to provide disabled and elderly people (and anyone else
who wants to use them) a 1 seat ride to the most popular destinations.

(a low frequency scheduled paratransit service).

It is low frequency (typically only two journeys, only 1 day per week)
and it is scheduled, but is it paratransit?

I thought "paratransit" referred to the (council operated) Dial-A-Ride
schemes.