Parking fine for Code 622

Hi folks, I need some advice on a PCN that was issued to me last week saying that I contravene the code 622 means "you parked with one or more wheels on or over a footpath or any part of a road other than the carriageway".

This is a parking bay on my street as you can see in the picture attached. Cars are not expected to be parked there between 10.30am and 11.30am. However, since I do have a blue badge and the road does have a yellow line, I am assumed that I could park in the bay. I set the clock on my blue badge to 10.00am. You can see from the picture that the blue badge is visible in the picture. The ticket inspector issued me with a ticket at 10.59. I have attached the parking sign picture. I would appreciate any advice on whether I am in the right and if I've got a good chance of challenging this PCN. It seems the ticket inspector's argument is that I parked with car tyres on the pavement when I shouldn't be at restricted time.