It looks to me as though the LR driver couldn't be bothered waiting for the silver car to make its turn on the roundabout and so cut into the red car's lane to undertake him, onto the road which then merged.
complete and total abuse of the size of his vehicle - utterly dangerous and irresponsible of the LR driver.
Another expensive car paid for by taxpayers for the sole use of the biggest benefit scrounger in Great Britain.