The Downton Abbey star plays Natasha Rostova in the latest BBC version of Leo Tolstoy's classic novel, and the lavish production is due to air from next month (Jan16).

Much of the shoot took place in freezing, snowy conditions in Lithuania, and Lily feared she would fall ill on the set when producers gave out some unnerving health advice ahead of filming.

Lily says, "Before we started shooting, we all got this email about hypothermia and it freaked me out. It said if you start feeling this or that, it means your toes are going to start falling off."

The British actress admits shooting in the snow in a flimsy period costume left her "freezing", but she battled through the shoot, adding, "I liked the endurance."