If being overtaken maintain steady speed, slowing if necessary to let the vehicle pass. That means not speeding up to block the manoeuvre. Also, when an amber light shows it means STOP, not wave your arms frantically at the driver in front.
Impatient BMW driver hanging on the shoulder & tailgating the car in front. Barely waits for me to pass them before he goes for a wild overtake, narrowly missing clipping the side of me.
The end