Re: And this ladies and gentlemen...
The UK has simple number plate formats. Any parking app should be able to correct 0/O errors because the number plate format dictates where the numbers and letters go, except some esoteric ancient and custom formats. But in the main, yes, certain letters are excluded from numberplates because of the risk of confusion.
(TBH RingGo does a DVLA lookup of your car when you enter the numberplate, to get a confirmation from you that all is correct, which would negate the possibility of this issue entirely)