I'm sorry that this isn't a direct answer to your question but I hope that it might point you in the right direction.
Disability Direct Derby is a charity aiming to provide support and information for people in your area. Their website gives this as the email address of the person who can provide information about accessible holidays:
raichelc@disabilitydirectderby.co.uk
Source:
http://www.disabilitydirectderby.co.uk/service s.htm
Chris



