Information from Dept of Transport website:

 

Who is eligible for a disabled person's bus pass

You're eligible for a disabled person's pass if you live in England and are 'eligible disabled'. This means you:

• are blind or partially sighted
• are profoundly or severely deaf
• are without speech
• have a disability, or have suffered an injury, which has a substantial and long-term effect on your ability to walk
• don’t have arms or have long-term loss of the use of both arms
• have a learning disability

You're also eligible disabled if your application for a driving licence would be refused under section 92 of the Road Traffic Act 1988 (physical fitness). However, you won't be eligible if you were refused because of persistent misuse of drugs or alcohol.