Thank you all for your responses. Let me address this in two parts:
1.How I Ended Up with Two Licences
I understand that I’ve technically broken the law by falsely reporting my UK licence as lost, but this was done purely for technical reasons so I could hand it over to the Greek authorities. They informed me that they require the original licence to issue a Greek (EU) licence, regardless of whether the licence is from the UK, the U.S., China, or any other non-EU country. This is just the standard process in Greece for converting third-country licences to EU licences. Importantly, they explicitly stated that they do not send the handed-over licence back to the country of origin. For example, if someone hands over a U.S. licence to get a Greek licence, the U.S. authorities would never be informed, and the same applies to the UK. As the UK is no longer part of the EU, the old rule requiring only one EU licence per person doesn’t apply in this case. Therefore, no notification of invalidation or revocation would be sent from Greece to the UK.
2.Assigning Points to the Licence
Setting aside how I ended up with two perfectly valid licenses, when someone receives a fine, they’re required to provide their name and their driving licence number. While names like Jonh Stewart or John Smith might be common and appear thousands of times, driving licence numbers are unique and serve as the primary identifier. If I provide my Greek driving licence number when fined, I would assume that the penalty points would be loaded onto my Greek licence. For all practical purposes, the system would treat me as a completely separate individual holding an EU licence. I could very well be a tourist with the same name driving in the UK. The EU driving licence has no connection with any NIN or UK passport! And from their end how confident would they be to just arbritrarily charge a UK driving licence with points only from a name match? So in practice I am very confident that they will never be any link between these 2 driving licences. (For the purpose of this conversation we can set aside the ethical side of things
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In the unfortunate scenario that I do something stupid again and end up with a fine I will definitely update you all with the results of my attempt