I wholly agree that all buses should be low-floor. What I don't agree with is how low-floor vehicles which are perfectly accessible aren't DDA-compliant for the most minor things which barely inconvenience disabled passengers.

Modifying these vehicles (or replacing them with vehicles which are DDA-compliant) would be a huge cost to a small business. What's better - a non-DDA compliant low-floor single decker turning up, or no bus at all?