Yep..I pay £500 fully comp on my Hornet 900 in Enfield. No garage, which a lot of ionsurance companies just won't touch now.
Ground anchor, Oxford Monster, plus the stock immobiliser. If I am going away...the Abus Granite U-Lock goes on the front too. And a disc lock on the rear.
Out and about, I use the disc lock on the back ( not the front.... ) and the Abus on the front....or to attach it to something if I am able to find something.
No device will prevent theft if someone really wants to take your bike. The idea is to make it as awkward as possible and let the thief go find an easier target instead.
I am currently planningf the most sensible precaution possible for when the F2 is road ready. Moving. To a house with a garage.