Kryptonite mini D round the frame and rear wheel to a metal railing. They used a cabled angle grinder. I've got the lock, it's cut through butter smooth, not even burred the edges.
Not much anything could have done to stop that. Tooled up to the max.
Richmond Road in Hackney. Left it for 40 minutes while I was in the GP and it was gone. Done the lock with a serious angle grinder too...
Poor thing. I've had some parts on that for more than a decade.