This is a very sad loss.
As leader of the GLC and then Mayor of London, I worked with Martin and people from all parties who wanted to bring about dialogue and a peace process in Ireland.
Martin played a key role in bringing about the Good Friday Agreement - an example of a peace process which has been learnt from throughout the world.
As Deputy First Minister in the Northern Ireland Assembly he then tirelessly worked for peace and reconciliation.
He was a key figure of his times, campaigning for Irish unity and against the injustices carried out under Britain's rule. The continuing rise of support for his party is a tribute to the leadership he contributed.
I send my thoughts and condolences to his wife Bernie and his family.
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