
Operation Spoke is York's bike registration scheme.
Local police have their eye on several dodgy lockup-garage dealers in the area - the sort of people who advertise lots of bikes of hazy provenance on Gumtree or eBay.
(One of the suspected fences, apparently, is a teacher. If you're offered a bike that seems too cheap to be true in York by a man with patches on his elbows and red pens in his top pocket, beware.)
But it's hard to prove a bike has been nicked - which is where this database comes in.
We stumbled across a Spoke Registration Event on Sunday (top right), ambling round a deserted York College.
No elaborate bike surgery involving transponders inserted into down tubes here. All that happens is a bloke writes a code number in various places on your bike with a special pen (right). The writing only shows up under UV light, if you take your bike into a disco for instance, or a public toilet in Hull.
Well, he said it was a code number he was writing. It could have been Ha Ha Big Nose. Probably best to be nice to registration teams, just in case.
There's a national self-registration scheme at immobilise.com, but Spoke sessions are worth dropping in on, partly for peace of mind, but also because you get lots of free yellow things (right): keyrings, spoke reflectors, trouser bands. There may be something predictable about our young cycling nephews' cracker fillings next weekend...

What I only spotted recently, though, was that the dog accompanying him is clearly peeing on his bike.
Such as here, for example, on the cycle track in the centre of York, near the Nestlé factory, yesterday. 
The Birmingham trip was an excuse to cycle the canal network, with its exciting tunnels (right) and quaint bridges.
It's a little-known fact that, compared to Venice, Birmingham's canals actually have more Somalian muggers.
A more enticing canalside notice (right) was here, somewhere en route to Bournville.
Obviously we didn't, out of consideration for the camera-toting trainspotter in the picture (right) awaiting the flypast of a goods train from Immingham.