We don't get much depth of snow around here, I think it's a sheltered spot, ten miles south and they'll have drifts and ten miles East the Peak District will be in total whiteout but not in this immediate area, The worst I can remember we got drifts a whole two feet deep against the hedges but it averaged 4" deep anywhere else.

By the way, how can you measure 3 millimetres of snow? I would have thought ground irregularity would have been more than that.