There is no reason to hold up traffic and cause drivers to be frustrated, to do so is just plain shitty!
Yes they may have the law on thier sides but the law as it stands is a whimsical farce that only slaves to idiocy would adhere too!
If a lot of cyclists acted in this way our roads could very quickly become grid locked!
To cause others distress or act in a way that is detrimental to thier quality of lives is wrong, anyone that is able to justify blatant manipulations of the law in certain circumstances, whereby for no good reason others lose moments of thier lives, is an asshole plain and simple.
Just out of curiosity and for future reference, If I wanted to pull in front of these cyclists at a safe distance and then slow down in front of them, for example to test out my brakes functionality, would that be legal?