Yes it does look like a window of opportunity is presenting itself.
The terrain is very flat around my way and it looks like >0 temperatures tomorrow so I'm going out there. The work I have is: first thing is I will clean a cafe in and out. I was meant to do it on Saturday but the battery died in my van anyway (now sorted). I will use neat screenwash if necessary for the outside as it's an early job. Then a couple of miles more to drive and start on domestics. Hopefully the inside of my van won't be frozen. Unfortunately the way I live means that I can't park near electricity so I have to rely on draining the van pipework each night. It does leave a little bit frozen near the pump though. No problem. Even without a functioning van mount I will still go for it if it's >0. It will just have to be containers and backpack and pull the water from the van mount with a jug if I really have to (shouldn't need to as I will probably be able to fill from static unit. Whatever way it works tomorrow, I anticipate fairly slow progress as I don't want to be slipping everywhere.