I was lucky earlier this year, they must have been disturbed, but there was a spate of ‘roof peeling’ in Otley: Peel the roof back, get in and unlock/open the garage door from the inside.
If you can fettle you bike, surely you can make your garage a bit more secure? A power drill and a spanner for some expansion bolts for a ground anchor, plus a pop riveter and some lockable gate bolts sliding into the door frame. Though, sadly in the end all you can do is make it harder. and if the bits are worth it, they will just chop the frame.
Ultimately though, apart from armed response (deeply tempting, possibly not warranted) the best thing you can do is insure it for what it’s worth.
Out of interest has anyone else experienced theft shortly after their cyclescheme bike arrived?