Apparatus for locomotion by land, air or water adapted for use by the aged or disabled; manual and powered vehicles for providing or ensuring mobility of disabled persons, patients and the elderly, particularly scooters, wheelchairs and mobility aid vehicles; power recliner back assemblies for wheelchairs; wheelchair wheels; racing wheelchairs and sports wheelchairs; paediatric wheelchairs; medical carts for disabled persons, patients and the elderly; wheelchair cushions, pads, seats and seat backs including foam, flowable and pneumatic cushions, pads and seats, and head-rests and supporting and holding devices on manual and powered vehicles for providing or ensuring mobility of disabled persons, patients and the elderly for their users; parts and fittings for all aforesaid goods