Dept of "should know better"

Cycling home from doing a little bit of shopping on Saturday morning, I was coming up to a junction where the road makes a nearly blind left turn at the point where another road joins from the right, with a traffic island in the mouth of the joining road (so a T-junction with altered priorities). Checking the mirror, there was a good gap behind me to another cyclist and then a couple of cars.

So arm out to indicate, and move over to near the white line... When suddenly the cyclist passes me, cuts in in front, then blithely bounces out again, entering the wrong side of the island. And never at any time did his hands leave his front tiller -- a piece of kit I really don't think should be road legal. Now, I'm used to the normal run of urban cyclist who usually has an arm down by one side and indicates by a twitch of an index finger or maybe a flex of the wrist; but this chap was too goddamn precious to make even that attempt.

I, of course, advised him of his unfamiliarity with the general rules of the road, but it irks me that someone supposedly serious about it should be such a bad advertisement for cycling as a mode of transport.