Quite an interesting video, there's a full onboard (from the car's view) of the MET police escort bikes. Spot the car pulling out on a white police bike with blue flashing lights and a loud as
**** whistle at 16:30
Came from this blog about how 'making progress' isn't about doing stupid speeds or even riding fast, it's about keeping moving at a decent pace, not having to stop for traffic lights, roundabouts etc. demonstrated by the police bikers who ride fast, then stop/slow down, ride fast, stop and so-on. The car being escorted isn't doing more than 20-30mph at any point yet still gets there at the same time.
https://glosthinkbike.wordpress.com/2016/01/15/making-progress/