Re people filtering on the left (almost always not a great place to be): I was filtering down the centre of two lanes on OKR today, dude who was leading a pack of lemmings filtering down the kerb on the left suddenly swerved over toward my gap, no shoulder check. I fucking shouted WOOOOOAAAAHHHH Have A Bloody Look Mate! He stopped and then did a hilarious wounded pride routine - followed me through the gap to the traffic light stop ahead by Asda, jam onto his front disc Way Hard after me to stop (I had moved over to let him get clear if the queuing motors) and did this stupid endo / bollock smash. I politely said 'Having some trouble with your brakes mate?' to he mumbled something incoherent along the lines of 'My brake is fine' but the light had already changed and I was already like Kaiser Sozay.
I was filtering a bit fast to start with so that was a reminder to me to chill the fuck out.