There are regulations setting out activities which teachers must have “the health and physical capacity to carry out”, such as planning, preparing and delivering lessons.
The regulations do not say how an employer should go about determining whether a job applicant has the health and physical capacity to carry out the activities specified. There is no general health standard that teachers must meet.
Teachers and trainees are required to be able to carry out the activities set out in regulations, no more and no less. Whether that requires a high standard of physical and mental fitness will depend on the requirements of the job concerned.
Enquiries about your health will normally be made as part of the process of pre-employment checks once you are appointed. Guidance from the Department for Education (DfE) says that where teachers are changing schools a “medical adviser may, where it seems reasonable, consider medical records from previous employment to decide that the person is fit to teach”.
For newly qualified teachers, the guidance says that a “medical adviser should obtain details of the applicant’s medical history from the medical adviser to the training provider”. These steps are recommended only once an applicant is appointed subject to satisfactory health checks.