The left hand lane was free when you made the turn so you should have been in it. The two cars from the junction opposite could easily have continued their journey in the right hand lane unimpeded. They must have thought that you were familiar with the highway code. They were wrong.
Hold your horses will ya? This is a static image - it does not give the full picture. We don't know the full details yet some are eager to go not on the basis of proven fact, but of speculation. The only proven fact here is the fact that, for reasons unknown, the car and the bust met at that point. Nothing more.
Drives in bloody wrong lanes