Great tips chaz and andrew. For the fuel stabilizer here in the US, Stabil is pretty much what everyone uses.
I start mine every 2-3 weeks, and run in up and down the street, even at 30F weather. I spray my engine compartment with a natural lubricant I got from first finish to keep rubber hoses supple.
No need to drain oil and fuel if you start it up during the winter time, as for the battery, a tender would be great, if not, just use the cut-off switch to disconnect the battery, so just swith it back to the on position once you start it up again every 2-3 weeks.