Recently I was parking close by Westfield Stratford (London) - The East Village Development.
I teach an outdoor class there sometimes. On this day I was in such a rush, by the time I got there I realized I'd forgotten my debit card.
The parking uses the online Ringo app, usually I'd pay, but I was unable to. I ran taught my 1 hour class. Came back 'phew' no ticket and went home.
This was on the 29/04/2018
A week later I received a letter in the post issued on 04/05/2018. (Nothing was placed on my car)
My class was at 11:00, I got there 5 min