That's correct. An enhanced criminal records check include information about all convictions, cautions, reprimands and warnings, and also a chance for the chief police officer to include any other information the police hold on you. This may include information on arrests and penalty notices for disorder which you have.
As has been said, it is totally up to the chief whether to disclose this PND or not. It has to be relevant to the position being applied for. For example, someone with an arrest for drugs who wants to go and work in a hospital would have their arrest disclosed. You with a PND for shoplifting who wants to go and work as a teaching assistance is a tough one to call.
I'm not sure what it would say about the PND or how specific it would be if it was to be disclosed. It would appear under the section at the bottom under, 'any other additional information.'
At the end of the day, you have been found guilty of doing nothing, since taking receipt and paying a PND constitutes neither an official finding nor an admittance of guilt; so really you are innocent until proven guilty. The PND is treated as intelligence. You have no criminal record.
If it was to be disclosed just say that it was under your bag and you didn't see it, very upsetting etc. Be sure not to make the same mistake again any time soon because you will go to court and then that will definitely affect your career; sure you won't though; it's a sobering experience.