Depth update. Hemel Hempstead very similar to Waltham Abbey....about 5cm. As at 11pm, snow is probably as heavy as it has been all day. Being blown off roofs and along pavements. Rural roads with large fields to the east may soon start to find drifts developing. Interesting that the amber warning area never included Hertfordshire nor the Chilterns and to the best of my knowledge was not modified to include them.