Re: Promises, promises...
"Brussels appeared to suggest that the Elgin Marbles could be the price of any future trade deal with Britain. A leaked draft of Brussels’ negotiation mandate had included a stipulation that Britain should ‘return unlawfully removed cultural objects to their countries of origin."
Greece is still pushing for this, and has the support of other EU nations.
Source:
https://metro.co.uk/2020/02/18/government-rules-returning-greek-marbles-part-eu-trade-talks-12263867/