Do I always need a doctor or nurse to undertake occupational health surveillance for me?

No! In many cases (where there is no requirement for statutory medical surveillance) there are things you can do to keep costs down by putting a trained, responsible person in charge of observing workers for early signs of ill health. You will still need to call on appropriately qualified (competent) professionals to deal with any ill health found. If you have a large workforce it is worth having a competent occupational health professional employed to be in charge of your programme to advise and assist you in management of health risks.