A skiier sharing tips with his friends on the slopes says staff at Wanaka's Treble Cone threatened to cancel his pass for unauthorised coaching, if he didn't stop immediately. James Sorrenson was on the mountain last weekend, when he says ski field staff approached him and told him to stop teaching his friends. Treble cone offers lessons with ski instructors, but it says recently there's been a spike of people offering unofficial lessons via face book groups and that's also a health and safety issue. Prices start at $240 for 1.5 hours and go up to $799 for a full day. A full day of group lessons (all levels) is $150. James explains what happened [embed] https://players.brightcove.net/6093072280001/default default/index.html?videoId=6335834039112