These are the last known videos taken by a British hiker missing in the Swiss Alps - released by his friends and family to try and identify the people he was with.<br /><br />Chemical engineer Aidan Roche, 29, fell out of contact on June 22.<br /><br />An experienced trekker and camper, Aiden was last heard from while in the Grindelwald area on the twelfth day of a two-week trip.
