Having lived in Wandsworth, SW London since 2011, this has probably been the best cold spell of the last 10 years for me.
Snow depth maxed out at only around 3-4cm, but I've never seen deeper around here. Pretty much a whole week with snow on the ground, and properly frozen ponds is something I've not really seen before too. Constant falling (very light) snow for 36+ hours was brilliant!
Admittedly, I missed the BFTE in 2018 because I was abroad!.
Previously to that, I had a great snow event with the Thames streamer in Feb 2009 (hit the jackpot with about 35cm near Leatherhead) and 2010 was great of course too.