Winterising too late

One of those dilemmas. Should I winterise? Or not?
North Star is due for some heavy duty interior rebuilding in February and so will need to be moved in 5 weeks' time. I wa rather hoping not to have to drain all the water and was hoping for a drizzly, mild, grey winter.
As the temperatures dropped day by day over the last two weeks I watched, hoping that there would only be a day or two of sub-zero and - rather stupidly - keeping my fingers crossed and blindly hoping everything would be alright.

Then two weeks ago, I decided that this was unlikely to work. The ten day forecast for Daventry was suggesting that it was going to be colder than the inside of a Texas post office in July. Sadly, my witless attempt to save a little bit of effort have kicked me back, as I am told that there is damage to the gas heater.

My next dilemma is that North Star is due for her safety inspection in February and I am not sure if she will pass with a damaged gas heater. If she doesn't pass, then is the insurance valid? Damn, damn and damn!