In reply to NIGBEE:
I went skiing recently for first time in 30 years (Austria), Ski Club of GB was easy to arrange and had good cover (inc. some type of climbing, but below level of my resort unless I paid extra). Probably your policy will want you to phone them ASAP in event of an accident if you cannot get to an EHIC accepting hospital or else they may not accept responsibility.
Incidentally once I reach 80 I'd get free lift pass at that resort (worth hundreds of pounds....but I'd think insurance premium for an octogenarian might surpass that).