Having watched the highlights and the incident again in more detail I agree with the poster that it is quite clearly offside, and quite rightly given. The question of the length of the review is still unanswered as the only part worth looking at was the Ramsey/cavani incident.
Not sure why our top referee and assistant (Stuart burt?) couldn’t have come to the decision themselves as Ramsey is clearly offside when the ball comes in.
Not sure why anyone is listening to pundits like shearer and Richards who clearly don’t know the laws, even waffling on to a totally different issue during an answer despite lineker reading out the wording of the law.
He's clearly offside yes, but at the point he becomes active in blocking Cavani Stuart Burt is looking through a mass of bodies and there is no way he could have seen Ramsey block off Cavani. Perhaps Michael Oliver could have seen it, but he would have only known Ramsay was offside if Burt had told him, and he appears to be looking at the main body of players and might not have seen it.
The problem is if they just checked this incident and Oliver said he didn't think it was interfering they would have then had to go back and check the possible touch by Watkins and offside by Ings, and the possible handling by Ings, and that would have been even more messy.