One of Argentina’s richest men is plotting an extraordinary bid to seize control of the Falkland Islands’ biggest landowner in what could provide a major test of Theresa May’s resolve on foreign takeovers. Argentinian property billionaire Eduardo Elsztain, through his Dolphin Fund, revealed on Wednesday he was considering a bid for AIM-listed FIH Group, which is also the disputed territory’s biggest retailer and controls its transport network.