How fast and in what speed zone?
GOV says........
The Police have misquoted the details. Does this invalidate the speeding ticket?
If the Notice has been given to you at the scene, and thus you are fully aware of the circumstances of the allegation, minor errors, for example spelling mistakes, will not prevent a prosecution. However, some errors are regarded as so fundamental that they will prevent a case proceeding. Typical examples are if the location detailed is completely incorrect and some distance from the exact place at which the offence is alleged to have occurred. In order to challenge a case along these lines, the Defendant needs to establish that it is practically impossible to relate a Notice to the incident itself.