 The study will take place in collaboration with an NHS hospital trust. Each week during the trial, the hospital trust will identify those Emergency Department attendances in the last seven days which, according to clinical judgement, could have been dealt with elsewhere. Patients will then be randomly selected to receive a letter containing information on alternative healthcare options for non-emergency health concerns. Patient records will be analysed to determine whether the patients who received the letter are less likely to make an avoidable repeat visit to the Emergency Department in the future, compared with patients who received no letter. 