Legal Disabled parking markings?

[ChocolatChip]

Is there a varied way that councils can display that a parking space is disabled? Or is it just the picture of the wheelchair?
I didn't realise that I'd parked in a disabled spot, I was sitting opposite my car having a chat with my friend, and still didn't realise until I noticed the guy was writing me a ticket.
I was unsure if the disabled bay was legal, as it was unusual and not obvious at all. There were several other people not displaying badges in the same spots.
I know that ignorance is not an excuse, but you hear a lot about these kind of scams.

[Pigletion]

Below is often a good web site for such things..

http://www.consumeractiongroup.co.uk/forum/parking-traffic-offences/144200-rules-regulations-parking-bays.html

a detailed challenge..
http://web.mac.com/rmbscarb/iWeb/rmbconsulting/Making%20a%20challenge.html

Also, check your local council web sites, as it seems not all councils have the same regulations