Shepard Fairey, creator of the Obama Hope poster, has donated art to be auctioned at London's anti-arms fair exhibition, which explores war, conflict and peace.
The UK Government licensed £648 million worth of arms to Saudi Arabia in the six months that followed the murder of Jamal Khashoggi in the Saudi Consulate in Turkey on 2 October 2018.
Campaigners argued that the decision to grant export licences is unlawful as there is a clear risk arms might be used in a serious violation of International Humanitarian Law.
Campaign Against Arms Trade says the Government should revoke all current export licences for such equipment as a first practical step to showing solidarity with the people of Hong Kong.
Human Rights Watch has accused the Bahraini authorities of torture, arbitrary citizenship revocations, and the intimidation and abuse of human rights campaigners.