Sutton's document about the exercise of discretion is mostly about circumstances when there isn't a contravention which doesn't need a policy other than that the PCN should therefore be cancelled.
There is an odd reference to the Traffic Penalty Tribunal which adjudicates on PCNs issued outside of London, not within, so not within the boundaries of the London Borough of Sutton.
Discretion Guidance Sutton Council by MisterMustard on Scribd
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