The 12 detectives at the heart of the Metropolitan Police's investigation into Downing Street and Cabinet Office parties have had to wade through an ever-shifting morass of rules.

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It's led to some people getting no Fixed Penalty Notices (FPNs), while at least one person got five.

A total of 83 people have been given 126 fines between them, for events on eight different dates.

Prime Minister Boris Johnson got fined for eating birthday cake but was not fined for other parties he went to.

So how did the detectives working on the investigation the Met named Operation Hillman decide who to fine and when?

Scotland Yard does not want to discuss the details of individual cases but it is possible to read between the lines, a bit.

Let's take the birthday cake gathering on 19 June 2020.

This was not people eating cake during the cabinet meeting, which would have been allowed. It was a separate gathering before cabinet, and some of the people - such as the prime minister's wife - were only there for the cake.

So this was an indoor gathering of more than two people with no reasonable excuse for anyone, and a breach of the Health Protection (Coronavirus, Restrictions) Regulations 2020.

The result was that the prime minister, his wife Carrie, and the Chancellor Rishi Sunak all got FPNs, as presumably did everyone else there. So far so simple.