IMO, this case is different to most footway parking cases where the prohibition has been disapplied to a whole road but only (wrongly) demarcated using existing and convenient(AKA cheap) posts and lamp columns because here discrete section of the road has been signed.
Is anyone arguing that this is simply a case of the whole road, or at least to where the OP's car was parked, allowing footway parking? Does anyone think that the 'footway parking is allowed but as they cannot find the resolution it must by extrapolation apply to the whole road, including where the OP was parked' argument would win the day?
And as for adjudication ...the referenced decision refers to 'on or over an urban road'..FFS, this was taken out of the prohibition years ago, what planet are they on?
Parking on footways and footpaths
(1)Section 15 (parking on footways, grass verges, etc) of the Greater London Council (General Powers) Act 1974 (c. xxiv) is amended as follows.
(2)In subsection (1)—
(a)for “on any part of an urban road” there is substituted “on or over any part of a road”;
Since 2008.