Under ICC regulations every bowler is allowed a maximum 15 degrees of flex in their delivery arm - a criteria that Ajmal's action satisfies - but Bob Willis told Sky Sports that perhaps the figure gives all bowlers too much latitude.
"The delivery that I have a problem is the doosra," said Willis. "The ICC have accommodated this delivery - they've changed the rules, basically, to allow these bowlers to bend their elbow 15 degrees. That's what makes it so difficult for the batsmen.
"The doosra is the delivery that all of the batsmen are struggling with and the authorities are now allowing these 'mystery' spinners, these unorthodox off-spinners to bend their elbow to a degree and if they are going to be allowed to do that then England have got to address it and say 'should we be teaching our young spinners to 'bowl' like that as well?'
"It's going to be a controversial issue. Michael Atherton wouldn't agree with me - he thinks that these people bowling with bent elbows is a good thing for the game and adds mystery and interest.
"Pakistan's bowlers, either with reverse swing or unorthodox off-spin, have had to produce something different to be able to get wickets in their own country.
"Why do all these bowlers bowl with their sleeves buttoned down to their wrist? Why aren't they wearing short-sleeved shirts? Why aren't they wearing vests like Australian Rules footballers so we can see their arm? The answer is clear, isn't it? They are bending their elbow."
Fantastic
Ajmal finished as the leading Test wicket-taker in 2011 with 50 scalps to his name and former England opener Marcus Trescothick told Sky Sports that the right-armer is so difficult to play because he scrambles the seam.
"Ajmal's given England nothing today," said Trescothick. "He's landed pretty much every time he's bowled the doosra - he's landed them very skilfully.
"If you can see the seam spinning in one direction, it makes it a lot easier to pick. Generally most spinners who bowl the doosra nowadays scramble them all the time because then you can't pick it because the ball is spinning one way but the actual seam is going in all different directions.
"It makes it very, very tough. You've got to be watching it very, very closely to see some form of rotation or you've got to be picking it from the hand.
"It's an ideal start for him and Pakistan. Ajmal is their key player. All the hype building up to the series was all about Ajmal and he's delivered. Getting seven-for is a fantastic achievement."
Willis added his own plaudits, saying; "The skill level is phenomenal - the control that Ajmal has, whether we think the delivery is legitimate or not, is unbelievably skilful. It is very difficult.
"As Marcus quite rightly says, when you first go in with the addition of this problem of the scrambled seam as well, it makes life very difficult for you indeed.
"The initial view of the England batsman seems to be to play on the back foot because if you've got men in front of the bat and you go out with that bat in front of your pad, you could give a catch. But if you survive for a little while, you can play him."
Ajmal says he has added a new variation to his bowling armoury - the 'teesra', a delivery that looks as though it will spin but which goes straight on.
Nonsense
However, David 'Bumble' Lloyd told Sky Sports that England's batsmen shouldn't be more concerned than they are already!
"I've dismissed it completely - I think it is utter nonsense, personally," said Bumble. "He's got an off-spinner and a doosra and the doosra is so effective because he is accurate with it.
"You can tell listening to the players that they are a little bit uncertain watching the wrist which way it is going.
"It [the teesra] didn't look too much different from anything else that goes down, to me - it just looks exactly the same. I'm fine with it. This lad for me is within the regulations of the game. But I think the teesra is for me a complete and utter con!"