please find link to picture, I live in the town of Euxton in the north west of England and the picture was taken in my garden.
http://s172.photobucket.com/user/Crumblyduxman/profile/

It is a wasp in the family Ichneumonidae. I'm not the world's greatest entomologist but I think this may well be the sabre wasp, Rhyssa persuasoria.
Have a look here for some images of that species and other possibilities (at least ones that get spotted in Leicestershire!)

http://www.naturespot.org.uk/taxonomy/term/19403
http://www.naturespot.org.uk/species/sabre-wasp

having watched Fortitude I can't say I'm keen on any Ichneumonidae!

Ah, c'mon, David, you can't write off a whole family of 60,000 species just because of a few rotten apples :-)