Sulphur sink smell

[meadows12]

Hi
We recently had a new kitchen fitted. Ever since there is a string sulphur drains smell every day or two.
It js coming from under the sink, but no smell from the plug of the sink itself or the dishwasher next to it.
From a quick google research it suggests it might be a problem with the AAV. From what I can tell I can’t see any AAV under our sink.
Photos: Double Belfast sink drains from above. Dishwasher to left. Quokker tap from right.
Does this sound like the problem, and is there no AAV which may be causing it.
Thanks in advance!

 

[denso13]

You don't need an AAV, looks ok to be honest.

 

[meadows12]

Oh. Any ideas where the smell might be coming from then?

 

[denso13]

Not from those pics, unless something is leaking.