New 20 MPH speed limit to also apply to bikes in Southwark

I was somewhat the victim of this the other day. On my motorbike with my girlfriend on the back. We came away from some pedestrian lights in the bus lane and had a people carrier in the lane to the right. I could see ahead that a car had parked in the bus lane so I needed to move over, behind the people carrier was a line of cars so not much opportunity to move in behind it. Accelerated a bit to move over in front of it but it sped up blocking me. I didn’t go over the speed limit or accelerate hard since I’ve a passenger holding on. Anyway, saw that the guy wasn’t letting me in so had to slow down to move over behind it when a space opened. As the car went past, I looked in and saw two uniformed police officers driving the unmarked car. Was quite shocked at the officer’s driving as he sped off.
TLDR, CSB etc