A mum I know is a long term sufferer of depression. Her DS missed out on first choice school, which has brought on a relapse. She has obtained a letter from her GP saying it would help the family if the child was to get the school place, and she's going to use it at the appeal.
Surely her GP should be offering therapies that can help her to cope with life's disappointments, not helping her to game the school admissions system? There must be thousands of other families in the same boat.