You might have to consider contacting your airline and taking your own, I think. But this seems to be quite possible (might entail hiring a suitable one in the UK?).
e.g. http://www.scootermart.co.uk/scooter-mart/airtravelscooters.asp

If this seems like too much hassle (and it could be, dependent on airline), then there are companies in other holiday destinations that hire out the appropriate eqipment for getting around
http://www.disabledaccessholidays.com/Information_UsefulLinks_for_disabled_people.asp

There might be more ideas here if this was moved to the " Disabled Person Holiday Discussions " forum area?

thanks phoebe for your help i will post in disabled holidays as well denise