Maybe off sick exhausted after having to do 3 people's work load.Recruitment, erm courses and training related to the NHS are oversubscribed. In addition to this, the NHS has a major staff sickness issue. There is no shortage, just over 100,000 people off sick every day. I've gone thru this before. The information is freely available ONS.
Another soundbite hero.zzz
So there is no shortage of doctors and nurses and others short staffed because everyone is off sick