Put your mind at rest - I doubt very much your conviction ever got on to any police computer.
If you wish to find out about your record, perhaps before you agree to a Disclosure check, you can carry out a �subject access� check on yourself under the Data Protection Act. To do this, you need to obtain a subject access form from the police. You can obtain the form by contacting your local police headquarters or by going on to the police force�s website. Some police stations also have copies of the forms. The checks cost �10, but can take up to 40 days to complete.
Worth a tenner for peace of mind.