Did you spot the Rod Harwin Racing sticker and fuel jug in the MCN paper today?
Petrol that's lots it's pop!
If you last filled your bike in November then the fuel inside it's tank will be slightly less volotile but not to the extent where it will cause damage. You'll probably find that the engine needs to be turned over for a few more seconds before it fires up into life, but once up and running it will be fine. Add fresh petrol at the earliest opportunity.