This was filmed in Tooting on Friday 18th September 2015 at about 7:40 in the morning.
There are two lanes leading up to the main set of traffic lights at Tooting Broadway, the left hand one being a bus lane. At the lights a third lane has been created to allow vehicles to turn right.
The coach driver uses the bus lane to get as far forward as possible, not a problem, but then when he moves across to get over to the right, he ignores the fact that there is a very large digger on his right and tries to force his way over. Most car drivers would have let him across because their vehicles are smaller then a coach, but the digger driver, who had priority in this situation, said "No".