Police launched a search for a British tourist on Lantau last night after the man failed to join other tour group members to catch a plane home to the UK. The search for Michael Gilbert, 55, involved a Government Flying Service helicopter and dogs and officers from Police Tactical Unit. It was mounted after the group's guide called police to say Mr Gilbert had disappeared and his passport, belongings and luggage were left in a room in the Silvermine Beach Hotel in Mui Wo. Mountain Rescue officers from Civil Aid Services joined the search in the afternoon. Mr Gilbert was among eight tourists who flew to Hong Kong from Britain on April 18. He was last seen by two female members of the tour group on Wednesday, when he said he was going to hike from Mui Wo to Discovery Bay and then go to Hong Kong Island. Tour group members fear he may have suffered heatstroke. He is bearded, wears glasses, is 1.8 metres tall and of medium build. He was last seen wearing a green shirt and grey trousers.