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The OP has already submitted a challenge so we'll need to wait for the response.

Morons.

Code 81 Parked in a restricted area,

You were issued a PCN for parking on a yellow line.....(which on the road would be code 12!).

Rather speaks for itself IMO.

They're idiots whose lack of knowledge is matched by their obstinacy.

Wait for the NTO IMO, and we can compile reps which focus on the key issues. Should be quite short.

They're not obliged to, but often do because although appealing is free for you, they incur a fee in the range of £25-£30 per appeal in addition to which they bear the internal cost of administration in preparing their evidence. This more often than not 'encourages' them to re-offer the discounted sum.