From memory, winter 2006/07 stands out for me. I live in South London, so lying snow is rare, but we managed at least two mornings of lying snow in January and February, despite the winter being one of the mildest ever. This is about as good as it gets most years. We managed a couple of mornings in 04/05 despite a high number of days with snow falling. We didn't have any lying snow in 05/06 and only one morning in 07/08 and that was in April. No mornings of lying snow this winter.