"It is because it is the anniversary of the biggest slave revolt in history, that UNESCO officially marks this day, the 23 August, the anniversary of that outbreak in Haiti, as slavery's official remembrance day. This is why we, in London, call for it to be the annual slave memorial day. We are therefore here to initiate London's annual slavery memorial day, and call for the establishment of a national, annual memorial day. In 1999, Liverpool became the first major British slaving city to formally apologise. The Church of England soon followed suit. In March I invited representatives of London's institutions to join the City of Liverpool and the Church of England for formally apologising for London's role in this monstrous crime. As Mayor, I offer an apology on behalf of London and its institutions for their role in the transatlantic slave trade."