Probably doesn't.
Many senior drs don't work full time for the nhs due to the tax and pension implications, if they work over a certain amount they don't gain much.
So they work a percentage of time for nhs. And their private work they put through a limited company to pay less tax.
If the tax system was less onerous on high earners, more senior drs would work full time in the nhs.
Also, same if patients were more respectful. I have always worked in nhs as believe strongly in equality of care. But the impact of the daily abuse and poor compliance, no shows and time wasting on my mental health becoming too great.
My friends who work mainly or solely in private practice are not paid a huge amount more, but have a better work life balance, receive more respect from their patients, feel their time is more productive as they are listened too and have better mental health as a result. And its becoming more attractive by the day.
Improve the tax system, and crack down on abusive behaviour and poor compliance, and you will see more drs working full time for the nhs.