It's all so annoying, isn't it?
I parked in a disabled bay, put my blue badge in the window but didn't open it out. I was in the shop for 10 minutes. I ignored the 1st letter, which claimed I hadn't shown a blue badge. It showed a photo of my car with the badge displayed! I got a 2nd letter, stating that the "fine" had increased to £100. I ignored it. Today, a letter from a debt company arrived. The "fine" is now £170. I checked on Martyn Lewis's website and it says that this particular debt collector agency cannot send bailiffs, seize any goods, nor take anyone to court. I'm ignoring that, then, too.
We'll see, but the fact that I've got a photo showing my blue badge in the window, makes me think I won't have to pay up.