In the UK when you are off work for some time you need a "fit note" to return to work. The doctor has the option to write on the note any special conditions - reduced hours, not operate machinery etc. Even if your are self employed you should get one otherwise any work related insurance is invalidated for you and the site your are working on.

Before christmas I had a one day battery of session with a Neurologist, Neuropsychologist and a psychologist funded by an insurance company. A few days later because of my balance problems from my head injury - fell down the stairs and got take off to hospital on a spine board with a several large bumps on my head. The hospital released me after 8 hours - unless you are in danger UK hospitals release you asap.

A month later the report from the insurance company comes through with an opinion that I could return to work. My doctor and a subsequent Neurologist were less than impressed by the report especially the last hospital admission and would not sign a "fit note" for at least 6 months.

As they pointed out a fall down the stairs could not only put myself in jeopardy but also any colleagues