Dash Cam failure

Recently bought a dash cam from ebay for 30 quid. Been using it to show the boss some of the daft places he expects us to get into for deliveries. Takes a good hd picture. Going into London off the M4 on Sunday night I got to the first roundabout up the A312. Left lane is for turning left to Hayes so I pull up in the middle lane at the lights. Lights go green and I head for the outside lane on the roundabout. Suddenly spot a black merc trying to undertake and pinch my lane. Gave him a blast of my horn and he zooms of into the distance. Didn’t spot the muppet in a little blue car right up his arse. He ran out of room when I side swiped him. He managed to get it under control so I followed him off the roundabout expecting him to pull up and argue the toss. He didn’t stop and disappears off into the traffic. When I parked up I had a look at my damage, and found only blue paint which I T Cut off with no damage to me at all. When I downloaded the clip into my laptop, I found that the number plate was unreadable because my lights were reflected off it. Bloke probably didn’t have mot or insurance so did not want to stop. Bet he had a bit more damage than me as I pushed him almost sideways. Cam would have been good if he had stopped and called police as it showed me in correct lane. Better luck next time.

has no one now a days has got a spare 2 seconds to wait.■■?
chances are also that somehow you would have been made to take the blame!!
dash cam seems a gem!

Maybe he had some of that illegal photo blocker spray on his number plate?

i think more just the reflection of the headlamps from the OP’s truck?
a possibility though?