Definitely significant and unexpected snow west of London late 1968, across what's now the London Borough of Hillingdon I believe it was October, because that's when I usually put my three tortoises into hibernation. My favourite was missing and as a 12-year-old I was half crazed. I was out there searching for what seemed like hours, and finally found Timmy snowed in under a hedge where it was dry. He hadn't dug himself in at all (too many roots, I guess) and there was a concrete step behind the hedge so he would have frozen if I'd left him there.
Yes, it was a memorable winter.
