If you pay your fine you do so because you accept that you did it and you are guilty.
If that is not the case, don't pay the fine and go to court.
If you do pay the penalty it does not show on your CRB, nor is it published in the paper.
No. Receipt of a penalty notice offers the recipient the opportunity to discharge their liability to conviction for the offence to which the notice relates or to request a court hearing. Payment of a penalty involves neither a finding nor an acceptance of guilt and removes the possibility of being proceeded against or gaining a record of criminal conviction for the offence for which the notice was issued.
http://police.homeoffice.gov.uk/operational-po licing/crime-disorder/index.html/212291/
By the way, is s.1 of the Theft Act, not class 1.