Withholding Information
In rare and exceptional circumstances information can be withheld from a patient (including information relating to their treatment).

There is justification in common that information concerning treatment can be withheld if it has been reasonably established that disclosure would cause serious psychological harm to the patient. The Data Protection Act 1998, which states that access to health records can be withheld if it could cause serious physical or mental harm to the patient, may also have some relevance. However, withholding information should not be done lightly and should be well justified and documented.

References