Postpublished at 12:09 BST 5 August 2019
The regulations do state that the on-field umpire makes the decision whether the batsman was playing a shot or not.
Aleem Dar signalling it might have influenced Australia's decision not to review it though.

England lose six wickets on final afternoon to fall to 251-run defeat
England had been 60-1 when Roy was bowled through the gate
Lyon takes six wickets and brings up 350 Test victims and Cummins, with four, passes 100 wickets
Australia's first victory at Edgbaston since 2001
Second Test begins at Lord's on 14 August
Matthew Henry
The regulations do state that the on-field umpire makes the decision whether the batsman was playing a shot or not.
Aleem Dar signalling it might have influenced Australia's decision not to review it though.
Glenn McGrath
Ex-Australia bowler on BBC Test Match Special
Aleem Dar shouldn't be saying that he's playing a shot. There's been a lot of talk about the umpries - the one thing you can give them is that they've been consistent.
Roy 22, Root 12
Jason Roy survives another brief lbw shout and sees out the over.
Daniel Norcross
BBC Test Match Special
That was a good edge, as well. England are clinging on. That was a catchable height if Paine stayed where he was.
Glenn McGrath
Ex-Australia bowler on BBC Test Match Special
I'm not sure why Tim Paine was going so far down the leg side.
Tim Paine hasn't had a great Test behind the stumps and makes another mistake here.
Jason Roy edges a ball from Peter Siddle just over the top of off-stump and the ball flies to Paine's right, the Aussie keeper having moved far too far to his left.
The ball streaks away for four and a chance goes down.
Ball tracking shows that lbw shout against Joe Root would have hit the top of off stump.
Umpire Aleem Dar deciding Root was playing a shot has saved the England captain.
Daniel Norcross
BBC Test Match Special
This game is afoot. That was quite an over.
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So England get through the first hour with the loss of only one wicket.
And breathe.
Jim Maxwell
BBC Test Match Special
It's a half-shot!
Phil Tufnell
Ex-England spinner on BBC Test Match Special
That's not a shot, but it sort of looks like one...
Joe Root pushes through the covers for two as Nathan Lyon strays short.
He rocks back and plays one that lifts nicely.
He then gets struck on the pad, with his bat pushed a little uncertainly behind. Hit outside the line but was that a shot? Umpire Aleem Dar signals it is and Australia don't review.
Another lbw shout off the last but nothing doing. That was a tough over. This is going to be such a long day.
Here it is.
Nathan Lyon comes into the attack on a turning pitch.
Andrew Samson
BBC Test Match Special statistician
Joel Wilson has had eight decisions overturned in this Test.
Stephan Shemilt
BBC Sport at Edgbaston
Can anyone help? I've got one of those commentary earpieces that let's you pick up the TV or radio at the cricket. I've just given it a new battery and, randomly, it's switched to picking up FM frequencies. I've got Radio 1, but no commentary....
This is the first one. You'll get a very similar video soon.
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Target 398
Joe Root has at least kept his humour during those two poor lbw decisions, reviewing that one with a broad grin on his face.
Jim Maxwell
BBC Test Match Special
I'm finding it hard to believe Joel Wilson will be standing in the next Test. He's not up to standard, no doubt about it. He's had a very bad game.