Speaking as one who has worked in the NHS, the monetary problems are mostly caused by much of their budget going straight into the pockets of private companies doing things the NHS are perfectly capable of doing themselved but a much inflated cost. For example, the water heater in our toilets consistently broke down several times a week. Serco, who provided the maintenance for us, made much more money by charging us £25 (in 2017 so it's probably a LOT more expensive now) just to attend several times a week, then an exorbitand hourly rate messing around for a few hours trying to fix it plus inflated spares prices when just fitting a new one would have been much cheaper and much more cost effective for the NHS.