£23m of parking fines may be unlawful: can you claim?

An investigation by the BBC has found that some 350,000 parking fines - costing around £23 million - may have been issued unlawfully in London. It's the latest in a long line of parking fine howlers, in an era when a fine is handed out every 4.6 seconds.

So what has happened, and is this the most shocking parking revelation so far?
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