okay, you can also claim if you are a war pension or registered blind. the other criteria :
have a permanent and sustainable disability which means you cannot walk, or which makes walking very difficult
drive a motor vehicle regularly, have a severe disability in both arms, and are unable to operate all or some types of parking meter (or would find it very difficult to operate them)
would be already claiming DLA
Bednobs most of these loads of people must have some sort of serious problem as these are not handed out like confetti, any person using a blue badge will have a significant long term disablement or war pension, most probably do claim some sort of DLA