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I am NOT responsible if you fall off and break something, but I think you're worrying too much. As @dbr said the roads were too dry yesterday for it to be a big issue on bigger roads. I've been out with him and our riding buddies in Hertfordshire before when whole lanes were covered in ice and we had to get off and push to a main road, that's treacherous!
I would have gone out yesterday and not really worried about it at all, but I'm sick this weekend (annoyingly).
It rained overnight and definitely hit zero, at least outside of London, so today might be a different story. But if you avoid lanes and keep a careful eye on the road you can normally anticipate where there might be ice and avoid it, in my experience.
Also, ride fixed. Definitely helps.
So we made it back alive. Only a couple of bits of ice, Roding Lane and then at a one of the fords we went through (!).
There's a section of dual carriage way that needs edited out, but generally pretty good. I definitely can't say it won't be icy but it was ok yesterday. Nice fast main roads until about 11am when it had thawed out a bit, then smaller but pretty much ice free B roads, though everything looked very dry so it'd be a different story if it had rained in the proceeding days.
https://www.strava.com/activities/471545260
http://ridewithgps.com/routes/11822656