This is what by default makes parking on pavements in London unlawful:
https://www.legislation.gov.uk/ukla/1974/24/contentsThis is probably the oldest extant legislation which applies in parking.
S15(1) creates the prohibition and s15(4) allows councils to disapply it in all or part of their area. 15(5) requires councils to place 'traffic signs' to mark the extent of any permitted area(signs aren't needed for the prohibition itself because it's statutory and you're expected to know). 'Traffic sign(s)' is a defined term, in this case signs in the Traffic Signs and General Directions Regs 2016. They have chosen the words 'Park in marked bays only'. This is not a permitted variant which is 'In marked bays'.
The regs do NOT have road markings for such bays.
All the council have is a couple of parking places whose presence is pursuant to a different statute and whose markings cannot be 'marked bays' for the purposes of footway parking.
Each parking place must be signed correctly. Theirs are not.
Regular unknowns:
Has the council even bothered to use s15(4 (known as passing a resolution)?
If so, to what extent?
Are the signs simply placed on convenient posts or do they actually mark the extent of permitted parking?
Why, if the short area between the signpost and the parking place is not a permitted area, did the council not place the sign at the parking place?
etc...
Are the parking places actually permitted to be partly on the footway?
All of which is grist to your representations mill and contained within the resolution(if such exists) and the Traffic Management Order which authorises the parking places. Hence why you're asking for them.