Fuel gelling never helps starting at the best of times. What with the temperatures being low and all, it could be a combination of things.
I've been starting on the button all year. First really cold morning, and she just turns over till the battery is flat.
The battery was pretty good really, but what with being stood for a day or two, plus high usage of it, wipers, heater blower, lights, and so on, it just hadn't got enough juice when the cold came.
Cold brings out minor little issues.
Blowtorch down it's throat will help.
Turn it on gentle, like. Last time I tried that I gave it full blast with a mapp gas torch, and it lit the condensed vapour that builds up from the crankcase breather. The foot long flame only lasted about two seconds, but it was quite a thrilling two seconds.