Hi there you appear from your phot to be driving in the outside lane when the inside lane is clear perhaps this is what cause the driver in front to undertake you .
Also using your iphone to take a phot whilst driving along a dual carrage way is not safe and would earn you 3 points if you were to be identified.
Clearly on either drink or drugs very clear from a photo of the back of his van .
Also You took this photo with your samsung galaxy edge ( SM-G928F ) you really shouldn't be using a hand held phone to take photos whilst in control of a vehicle .
Hi there you appear from your phot to be driving in the outside lane when the inside lane is clear perhaps this is what cause the driver in front to undertake you .
Also using your iphone to take a phot whilst driving along a dual carrage way is not safe and would earn you 3 points if you were to be identified.