Lack of qualified staff willing to work at the current pay rates. There are shortages in plenty of sectors at the moment so medical personnel who have had enough are leaving or retiring early and they can’t be replaced because pay rises are not keeping up with inflation. I’m going to look for my source just now but I read that there are 100,000 vacancies in the care professions currently. Postal workers, train drivers, bus drivers, dockers and barristers(!) are all planning to strike in the next month or two because of inflation effectively causing large pay cuts.