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I fancy it just the prospect of ice puts me off slightly - speaking as someone who's definitely owed a broken collarbone from all the ice crashing I've done and somehow got away with until now.
honk-
I rode it late November 2018 according to my calendar.
There was no risk of ice when I rode it. I generally don't go out if it's icy, having seen poor Desi break bones on totally invisible black ice corner many years ago.
It's a pretty easy call - if it's been wet and then the temp drops near zero - I'll be having second thoughts and depending on how hard it is to get to the event, will make a call.
I started a Willesden or Westerley event one year and didn't make it to Uxbridge - because there was ice around I turned around. I'm not ruining a whole season for one winter ride (nah, instead I'll ruin it with one summer ride!).
hippy
I've done it. I think I was first back one year as I basically used most audaxes back then as training rides for races.
Whatever the weather forecasters say the temperature will be, it won't be, it will be colder.
Factor in carrying capacity for more food - not much open at night.
Try and sleep well before the event.