Is it time to start calling out bad cyclists?

There are few things more satisfying cycling in London traffic than preventing people riding down the gap between a vehicle and the kerb. The more ridiculous angle you have to put your bike at to stop them, the better.

I will try the blocking technique and see how it goes. People often undertake me as I wait behind an hgv. I put it down to them not using clipless pedals and having greater ease of scoot.