The NtK is not PoFA compliant for a couple of reasons but, as others have already said, this non-compliance rarely works in the first two appeals.
Firstly, if your were a genuine customer of Iceland then you should speak to the manager as they would have the power to get it cancelled - take the NtK with you so you can demonstrate the minimal (petty) contravention.
Whilst you are there I would get some pictures of the signage (as already advised).
I have examined the signage as best I can on GSV and I cannot see a specific clause regarding marked bays but I am examining a pretty blurry image so I cannot be 100% certain on that point.