Is it time to start calling out bad cyclists?

It's all well and good saying don't filter to the front but if I did that it'd take me the same 2.5 hours to ride to work that it takes to drive.The whole point of riding a bike is that you can filter past traffic. A lot of my commute is filtering past traffic that runs in one solid line from one traffic light to the next. Where do you draw the line?

Not filtering to the front ain't the same as not filtering.

Like snotter, I'm happy a couple of cars back because it takes the pressure off when the lights change, especially in 20mph zones when it's not that difficult to keep up with cars. If you're at the front you'll be regarded as holding everyone up, even if they're not actually going any slower than if you weren't there.

Unfortunately all this is rarely any use in rush hour because even if you're not at the front all of London's slowest cyclists will be.