A demonstrator wearing a mask depicting Britain's Prime Minister Theresa May takes part in a Brexit protest outside the Houses of Parliament in London on March 13, 2017 (Photo: AFP)
Demonstrators are gathering outside the British Parliament in advance of a vital debate on Britain's planned exit from the European Union.
The group is opposed to Prime Minister Theresa May's plans to take Britain out of the EU by triggering Article 50 in the coming days.
One protester wore an oversize May puppet head. The group wants Parliament to have a "meaningful" vote on Brexit terms
The House of Commons is set to debate Brexit Monday afternoon and evening.
It is expected Parliament will eventually give May legal authority to start Brexit proceedings. Britons voted in a June 23 referendum to leave the EU.
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