As part of my case next month Croydon has provided me with this 'reason' for one of its' streets.
Basically, naughty drivers see a CEO and drive off - fancy that!
'This road is a bus corridor and short term parking is high in this area causing longer transport delays. Civil Enforcement Officers enforcement is not viable for short term parking which does (sic) cause obstruction to buses. Civil Enforcement Officers are not practical for this type of enforcement due to drivers driving around the block and re-parking when the officer has left the area and it is a difficult area to clear of short term illegal parking'.