Siope
*In any case it’s for the British Museum to decide*
It’s not. The Sculptures belong to the government, and are only in the trusteeship of the British Museum, and the British Museum Act (1963) prohibits them from being fully returned. Sunak is on record as saying he will not even consider changing that legislation.
Starmer also said he wouldn't not change the law but this too is an irrelevance, a distraction, as what they are suggesting are future loans. The sort that happen across the world, all the time between museums Siope.