I was wondering if today's proceedings constituted a proper polar low.

It seems that the snow arrived in the South East at just the right
time (at a cold night, just before daybreak). I also noticed on the
radar that the shallow low seemed to be winding itself just to the
west of London - prolonging the precipitation.

My last question is why did we have to wait until April 6th for the
first proper snow of the winter (in London)? - though there was
appreciable amounts of snow I'm sure there was enough energy from the
sun through the clouds to effect a thaw - something which would not
have happened in January...