just seen on Twitter another angle of the Walker sending off. Sky neglected to use this angle which is a shame as it clearly shows what appears quite heavy contact on the chin from Walkers shoulder. I still don't think it's a yellow still, i think Walker is just trying to make himself big but DCL was clearly hit in the face and not play acting like that RS plank on Monday Night football was implying.
Pre meditated for me mate, you can see Walker looking over clocking where Lewin was, he was trying to be clever by using his shoulder instead of the elbow, bang out of order.