Thanks everyone,
sim time looks like the place for it then or maybe just logged as normal with the hours not counted. Hadn't even noticed my trusty pooleys logbook had a sim section until you guys mentioned it! Shame though as would have been a great hours-building scam to get work to cough for 16+ hours a year.
I'm sure it's only 'walt-like' if you pay for it (or possibly build it in your garage?).