 On 16 January 1947, they sent two memoranda, whilst a Burmese delegation headed by Aung San was in London, to the British Labour government of Clement Attlee demanding equal political footing as Burma proper and full autonomy of the Federated Shan States.He was not one of the six Saophas who signed the Panglong Agreement on 12 February 1947.The Cambridge-educated Sao Hkun Hkio however became the longest serving Foreign Minister of Burma after independence in 1948 until the military coup of Ne Win in 1962, with only short interruptions, the longest one of which being between 1958 and 1960 during Ne Win's caretaker government.