Pragmasis stuff here too... 16mm chain and lock, front and rear, both locked through a Torc anchor, and using an Anti-Pinch Pin at the rear too. I use the same set up for all the bikes. If they can get past the locked and secured garage, the ADT monitored alarm, the CCTV and want to take the front wheel and swing arm off to get the rest of the bikes...they can take 'em!
Could park the car in the garage and chain the bike to the car. Or dig a moat and get a boat and park the bike on the boat and chain the boat to the Eiffel Tower.
You couldn't find a more helpful, passionate or knowledgeable Guy than Stephen at Pragmasis, it's a small British cottage industry firm and they designed and manufacture a lot of the chain & lock related accessories themselves.