A secret training base 25 miles from the Ukrainian frontline is not a place you’d expect to encounter a softly-spoken 26-year-old from Northamptonshire.

But this former member of the Royal Anglian Regiment is one of a growing number of foreign fighters – veterans and civilians alike – who have been signing up for Kyiv’s armed forces. And this particular Brit, who can only be identified by his call sign Snow, has no illusions about the dangers he faces.