British tourist Gareth Koch, 24, has been missing for nearly a month in Nepal after leaving for a trek to the Sagarmatha area. He was due to return home on 20 March but failed to do so or call to inform his concerned parents about a delay in plans. A friend who accompanied Koch till Lukla has returned to the UK safely. Koch is a 5ft 9in Caucasian with light brown short hair and an appendix scar. Any information on Koch's wherabouts can be reported to the British Embassy, 4410583.