They’ve just had an in depth interview about it on ITV Racing with Rishi Persad.
It is claimed that viewing footage from both head on and behind, showed the horse to be running in a true and straight line, and that it was only after the race as he followed the track round to the left that his action changed markedly when he slowed down to a trot.
They did not show the head on or rear footage. Footage of the horse slowing down and being dismounted is available on Twitter.