Rather than paid for through the health service, those will normally be paid for by the local authority - if they pay for them at all.If you follow the link from the Wikipedia page, you find:
Today, the man who provided the frantic but always distinctive and highly original rhythmic backbone that ran through Iron Maidens first three albums is in a wheelchair. Sometimes, just getting out of bed to face another new day is a struggle. I do get tired, he says. I cant always do what I want to do. His drums are in the garage at his specially adapted house in Wanstead, east London, which he shares with his partner Mimi, a former Sundayschool teacher who also has MS.
...
They bought me a vehicle... He pauses. Meeeeeeeemes, what car is it again? he shouts. We call it the Clivemobile. Its a Volkswagen Caddy with blacked-out windows. Its like an American gangsters car. Theyve put concerts on to raise money, not just for me but for other people with MS. They put a stair-lift in our house.
http://archive.classicrockmagazine.com/view/february-2011/32/when-drummer-clive-burr-was-ousted-from-iron-maide
And it may also have involved, for instance, paying off the mortgage on the house. He's unable to work, and his partner probably is too, since she's just described as "a former Sundayschool teacher".