All we have to do is remind the Welsh of the legitimate try England scored at Twickenham that wasn't given and it would have been a different story.
First of all, it wasn't legitimate so it's irrelavent. He didn't have clear downward pressure on the ball so end of story there.
Secondly, even if the TMO got it wrong and ended up awarding England the try you'd still have to knock it over the posts from as far to the side as possible.
It's all about the GRAND SLAM baby