I had never been to England but in my place, any person who entered a psychiatric unit is searched for items that might be use by the patient to harm himself, other patient or staff, this could be anything from your bandage scissor to a piece of string, to your pen. Visitors or non medical staff are searched and advised appropriately, items are confiscated and returned after the visit, but again this would depend on the particular unit they will enter. Some units are very strict some are not. For medical staff usual precaution is always maintained, items ofcourse are not confiscated but kept away from patient and again it will depend on the unit you are in, no orifice search ofcourse. If you think that you have a lot of suicidal or violent patient like Hannibal Lecter be careful :) but most psychiatric patient are actually harmless.