The arrangement of signs and lines is so contrary to regs it's difficult to put into words.
You cannot have permitted footway parking where DRL are marked on the carriageway.
End of.
But TfL are likely to huff and puff and not accept the matter, certainly initially.
Your case is distinguished because the only reason you got a PCN was because you were not parked within a marked bay. But parking in a marked bay on the footway is not a defence against DRL anyway?
And the marked bays are tosh anyway because the footway parking sign doesn't require vehicles to be parked within marked bays - if it meant it then it must state it!
What a c**k-up.
Can't wait to see their response.