Any patient who is referred to a UK hospital has their transport to that hospital paid for by IOM DHSS. Most such referrals are to hospitals in Merseyside/Wirral and the overall number of such passengers apparently runs into several thousand each year. I'd imagine that Euromanx have most of this business via LPL.
Family members also get some travel too, but it was reported earlier this year that this was being reduced significantly after it transpired the DHSS's own guidance on eligibility wasn't being adhered to correctly.