House of Lords passed 4 amendments against Starmer's Chagos transfer plan. Amendments require payments halted if Diego Garcia becomes unusable for military use. Liberal Democrats pushed for Chagossian referendum and cost transparency. Bill returns to Commons for potential rejection, delaying treaty finalisation. UK committed £13 billion under 99-year leaseback for Chagos. Mauritius seeks sovereignty; 2,000 Chagossians demand return