Parking Ticket from CMS UK Ltd

Thanks for the advice i may well speak to manager of cinema as they had gone to see harry potter so it was very busy and i had already made prior arrangements with them for my son to enter the cinema without having to queue due to his disabilities.

Hi everybody, I know there have been many posts in this thread but I am just checking that the information is still current and up to date?
The reason I'm asking is because I have just been issued a 'Parking Charge Notice' by CMS while nipping into a shop on the Riverside Retail Park in Warrington, Cheshire. The car park was pretty full as it is a Sunday so, knowing I wouldn't be long, I just parked in a disabled bay right outside the shop I was going into as ALL of the disabled bays were empty, not a single disabled bay in the entire car park had a car in it.
On getting to the checkout I had the usual queue to contend with and, as I reached the front of it, I noticed a parking ticket on my windscreen. I thought at first that it may have been one of my mates playing a prank on me but when I got outside and opened the plastic bag stuck to my windscreen I found a ticket inside saying I had to pay £90 but if I paid within 14 days it would be reduced to £55 and the reason was 'not displaying disabled badge' no mention that it was a disabled bay but they had taken 5 photos.
I was quite angry and annoyed as I'd only been about 10 mins and looking at the time on the ticket I realised it must have been issued within 2 mins of me walking inside the shop. I looked around and finally found the guy that issued the ticket and took him to task over it's issue. He wasn't bothered about anything I said, just grinning at me and saying 'you shouldn't have parked in a disabled bay!'. I explained I had just nipped into the shop I was parked outside (it's not like I parked there and wandered off somewhere else) to which he said 'You have been in there for ages!!'. I pointed out that his 'ages' was a total of 15 mins from the time the ticket was issued to me talking to him. Again he told me he wasn't bothered and continued with his sly grin. The only time he took any notice was when I took him to task about the signage within the car park and it's contents. There were no signs outside the shop that I visited, in fact the closest sign was at least 100 ft away from where I parked. I also pointed out that the signs had no geographic confirmation of where we were. There was nothing to indicate the signs were for the retail park I was on. With this his attitude changed a bit and he claimed 'That's not my fault! It's nothing to do with me!! That's my bosses job!!'. I also pointed out that it was a free car park, it was a Sunday so ALL of the car parks in the area were free and unmanned and that, as far as I was aware, it was illegal to issue 'fines' or clamp cars these days unless you were the police etc and it was public property. Again he just said 'Nothing to do with me! Just phone them up and they might let you off with it!'. I was now extremely annoyed but thought better of causing a scene and went back to my car determined to contact CMS as soon as I got home. To my surprise (not really) I found that they are not open on a Sunday so I would have to wait until tomorrow to vent my anger. It was only while I was looking for their website that I discovered this thread and thought I would see if anybody would be so kind as to offer me any support?
I have no intentions of paying this 'fine' unless I have to do so legally and I have taken a picture of their sign to show there's nothing on it that states the geographic area that their 'warnings' refer to.

Thank you