British Prime Minister Andy Burnham is seeking to renegotiate the Chagos Islands agreement with Mauritius, offering the US-Denmark Greenland deal as a model for Diego Garcia. The current treaty grants sovereignty to Mauritius while guaranteeing UK/US access for 99 years to the military base. Burnham and Mauritian Prime Minister Naveen Ramgoolam aim to complete a revised plan by the end of 2026.