Yet the NHS workers doing the op don't have to isolate.
The NHS workers are wearing PPE.
The patient isn't wearing PPE, and, if having a GA, is having an aerosol generating proceedure where their saliva and lung-fluids are being atomised and sprayed all over the theatre.
If the patient has isolated then they're only a green pathway and only 'normal' cleaning is needed.
If they haven't, then they're on an amber pathway and the theater needs to be left for the aerosols to settle, then every surface (walls, ceilings, chair legs...) cleaned before the next patient can be treated.
Lifting the requirement to isolate dramatically increases how long each patient takes, which means the current enormous backlog will just get bigger and bigger.
If you're on a green pathway and have self-isolated, how would you feel if the patient before you had decided not to? Because they are putting you at risk.