I've been lazy I do confess. Took the D-lock off the Scaffolding Bike for weight weenie reasons over the summer, never put it back on. Was using a Kryptonite Flexlock cable and an Abus padlock.
Bike locked up outside the national library on George IV Bridge, when I went to unlock it the cable came away in my hands. Snipped with bolt cutters but left in place. Three possible scenarios;
1) The raven food was disturbed mid-theft.
2) The raven food cut the cable, looked at the bike and recoiled in horror at the unsaleable mish-mash of vintage and modern parts.
3) I'd accidentally threaded the cable through the other bike on the stand and that bike belonged to an impatient psychopath who carries bolt-cutters around in her panniers.
I'll ask if the library has CCTV on those racks tomorrow - don't suppose they do.