I thought that parking restriction end at 1pm but actually realised afterwards it ends at 5pm on a Saturday.
The sign posted clearly shows that payment is required Mon-Sat 9-5.30pm, so I've no idea where 1pm comes from, it's never 1pm, unless the sign we've seen is incorrect?
So, what do we have?
At its most basic level, a higher level penalty for a 30-minute overstay.
I think we should examine the 12 v 19 issue. And code 5.
Grounds for reps:
Penalty exceeded the amount applicable in the circumstances of the case.
OP, read the list of contraventions here:
https://www.londoncouncils.gov.uk/download/file/fid/4029You were parked after the expiry of paid for time, which is a lower level penalty.
You were also parked with an invalid P&D ticket. Again, lower level.
So, my approach would be that you saw the sign but just miscalculated when you would return. In this respect, the sign is your ally.
I think we need to broaden the approach here.
But it's just a view.