Kyaw Zwar Minn told Reuters “I have been locked out” after opposing the new regime.
Hundreds have been shot dead by security forces since the army seized power on February 1 overthrowing the civilian government.
Reuters reporter Poppy McPherson tweeted: “Something odd happening at the Myanmar embassy in London.
“Police have cordoned off the road and the ambassador seems blocked from entering.
“Members of the Burmese community are gathering outside.”
Aung San Suu Kyi, Myanmar’s prime minister, was arrested and is currently in military custody.
The army claimed the coup was a response to election rigging but this has been rejected by independent election observers.
A protest against the coup took place outside Myanmar’s London embassy on Wednesday evening.
Police were on the scene but made no arrests.
On Wednesday another 15 people were shot dead in Myanmar protesting against the coup according to local activists.
Many others were injured after security forces used live ammunition against protesters.
More to follow…