speeding is always illegal, overtaking or not!
he wont get banned for 101mph, prob get 6points and a fine of around £300
flashing your lights to someone isnt entrapment at all, according to law, flashing your lights to someone is to show that you are there , thats all, so the copper just highlighted he was present on the road by flashin his lights so ya mate aint got a leg to stand on, shit luck but thats life unfortunately.
tell himto lube up coz the court will shaft him