Virgin Atlantic
https://flywith.virginatlantic.com/gb/en/prepare-to-fly/mobility-medical-assistance.html
British Airways
https://www.britishairways.com/en-gb/information/disability-assistance/assistance-available
EasyJet
http://www.easyjet.com/en/help/boarding-and-flying/special-assistance
Ryan Air
https://www.ryanair.com/gb/en/useful-info/help-centre/faq-overview/Special-assistance
Thomas Cook Airlines
https://www.thomascookairlines.com/en/fly-with-us/special-assistance/assistance-for-customers.jsp
Tui
https://www.tui.co.uk/destinations/info/faq/customer-welfare
FlyBe
https://www.flybe.com/assistance
Jet2
https://www.jet2.com/faqs?topic=medical-and-special-assistance&category=mobility-assistance