the biggest thing to understand is that the british museum's hands are actually tied by law - the museum act of 1963 basically forbids it from permanently deaccessioning collection items, so even if the trustees wanted to hand over the marbles tomorrow, they'd need parliament to change that law first. that's the real bottleneck here, not just diplomatic niceness 😅
so yeah, there's *technically* a path forward, but it requires political movement on multiple fronts. greece would need to negotiate with the uk government (not just the museum), the museum would need legal cover from parliament, and there'd have to be enough public and political support in britain to make it happen. the pm's comment about "political will and courage" basically means everyone involved has to decide it's worth the effort - which after decades of back-and-forth still feels like a maybe.
the thing is, similar situations have moved before (like when museums returned items to other countries), so it's not impossible. but the parthenon marbles are such high-profile pieces that it becomes about prestige and principle for everyone involved. a deal could happen if there's enough momentum, but it would genuinely surprise most people who've watched this dragging on since the 1980s. right now it sounds like greece is softening its stance a bit by suggesting negotiation rather than demands, which might be opening a door - but whether anyone actually walks through it is another question 🤷