My local council charges blue badge holders so I have two things to remember - display the badge and buy the ticket. Few weeks ago I forgot to pay so that was £25 fine. Yesterday I paid then when I got to the physio I found the badge in my handbag where it lives in case I go out in hubby's car. Warden was patrolling car park when I left it so was sure I would get a ticket but I didn't! No idea why.
So now I am going to stick a note on the dashboard to remind myself of two things to do when I park. (Unless of course it's the next council up the road which doesn't charge....)