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.
Today was not a good day for me :(
This driver ran 3 red lights and almost ran a third he/she shouldn't be on the road