Try the Scottish Gliding Centre at Portmoak near Kinross in Fife ( Jct 5 off the M90 ).They have a scheme called "Walking on Air" and operate a specially adapted K-21 to enable disabled people to have lessons or Air Experience flights. They even have a special device to help the people into and out of the aircraft. Contact them on 01592 840543 or visit their web site at
www.scottishglidingcentre.co.uk