I haven’t researched the history, but I‘m guessing the marbles were effectively stolen by some entitled Tory or other who just thought “these are mine now” and took them, as entitled Tories have done with so much land, artefacts and people throughout history. As such the oligarch PM is only doing what one would expect of his ilk. It isn’t as if he understands the concept of paying his way.
Oh no not just some tory scumbag, Lord Elgin, he literally ripped the parthenon Frieze from the temple and carted it off back to London.
I've been to the Parthenon, back in 1987, it's absolutely astonishing despite being vandalised by the tory toff and the turks who used it as an arsenal and some of the explosives blew up inside the temple.
"Elgin's procurement of the marbles was supported by some, including Goethe,
[21] and censured by others in Britain as vandalism, most famously
Lord Byron,
[22] who wrote the following lines
[23]
Dull is the eye that will not weep to see
Thy walls defaced, thy mouldering shrines removed
By British hands, which it had best behoved
To guard those relics ne'er to be restored.
Curst be the hour when from their isle they roved,
And once again thy hapless bosom gored,
And snatch'd thy shrinking gods to northern climes abhorred!"
en.wikipedia.org