As predicted in Leila’s oped in Forbes (see http://www.forbes.com/sites/realspin/2014/12/23/the-british-museum-should-return-the-parthenon-marbles-to-greece/), and after Leila contacted Amal Clooney regarding this strategy, Greece may have elected to pressure the UK to return the Parthenon marbles by denying a loan to the British Museum (http://news.artnet.com/in-brief/will-greece-deny-british-museum-loan-over-elgin-marbles-controversy-212855).
