Let me guess, the British government just confiscated everything, and if you'd found it, you'd have stolen it and kept your mouth shut. DSM-5 301.7 (F60.2).
Finders keepers, losers weepers................
Actually, SunkenCiv, I think you unfairly malign their process in this case.
Yes, as a rule, for portable treasures, including coinage, over 300 years in age, the Her Majesty's Government exercises right of first claim. Comparative valuations are computed and both the finder and land owner are compensated on that basis. Given that this Treasure Act has been in place since 1996, it is already known by most seekers.
To me it seems a justifiable compromise for a nation's patrimony. The famous Saxon Hoard from Sutton Hoo might otherwise be unseen in a private collection rather than on Public display!