On July 21, 1966, he was accredited by Ugandan president Milton Obote as High commissioner (Commonwealth) in Kampala (Uganda).
[4] On July 7, 1967, Colonel John Hugo brought him to Buckingham Palace, where Elizabeth II received his Letter of commission.
[5] On April 25, 1969, he was received by Léopold Sédar Senghor as the first Zambian High Commissioner (Commonwealth) in Senegal.
On 25 January 1971, Ugandan rebel Idi Amin forced the then-president of Uganda Milton Obote with M4 Sherman tanks into exile to Tanzania, under the protection of Julius Nyerere.
On January 26, 1971, Simbule declared that the words of the first Zambian President Kenneth Kaunda were considered the joke of the day.