Holidaymakers who plan to invest in an extreme sport activity have been urged to insure their travel insurance covers them for all eventualities.

According to figures released by the Post Office, medical expenses amount to 72 per cent of ski holiday insurance claims, but many of us plan to travel to such dangerous spots without any type of cover.

Post Office head of travel insurance, Rachel Croft, said: "Medical costs in popular eurozone ski destinations such as France, Italy and Austria could be around 18 per cent higher than this time last year. And skiers going to Aspen or Vail in US are looking at a massive 29 per cent hike."