I'm not from the UK and don't have a horse in the race, but a lot of people from the UK have been coming to where I live (Thailand) to receive medical care since I have lived here (more than 20 years) to escape the wait times. The few I spoke with definitely did not call NHS a beacon.
My few conversations are certainly anecdotal. However, the numbers of UK medical tourists isn't; it was around 4,000 in 2010 and estimated to be around that number each year, according to this paper [1], although it acknowledges the number is underestimated.
[1] https://globalizationandhealth.biomedcentral.com/articles/10...