I've measured a snow depth of 8cm with 11cm drifts. I live 9 miles west of Leicester and got stuck for two hours in the city in the snow, with the cars struggling with momentum. Me and my family originally decided to go after some hesitation because it was turning sleety, but soon after we got there it turned very heavy indeed. Non-stop snow since 2.30pm only becoming lighter snow.
I've certainly got more than I originally thought.