Upon speaking to a few ex-colleagues in the police force, they said they are getting that many calls about Covid breaches & people not self isolating, that many calls are simply not being followed up.
Don't forget - pre-covid, the police were stretched enough with routine jobs like domestics and mental health. The Covid situation is just yet more work for an overwhelmed police force.
I would say - once being in the police myself, that the Nottingham incident involving the 30 students and the £40,000 fine, would probably have been reported as a 'disturbance' with multiple 999 calls being made by the residents in the street. Therefore, the local cops would have had to act on it.
Its fair to say that if you do not follow the rules (to a T) and don't make a drunken numpty of yourself, there is a very slim chance of being fined. All the people who have been slapped with fines seem to be the type of idiots who bring attention on themselves through having parties or displaying nuisance behaviour (normally fueled by alcohol).
Going back to the original topic - if people do decide to have a meal and a few drinks at Christmas it is unlikely they will get fined unless they are very unlucky or very stupid in their behaviour.
CJ