Muslim protestors from all over the UK are converging on London's Wembley Conference Centre to picket Gujarat Chief Minister Narendra Modi.
Modi, criticised for not doing enough to protect innocent Muslim families during last year's communal riots in his home state, is spending six days in the UK as a guest of local Gujaratis represented by Friends of Gujarat.
The British Home Office has said there are no grounds for refusing Modi a visa.
Modi's visit is a private affair and he does not plan to call on any members of the Blair government.
But the visit promises to be controversial with Indian Muslims from the northern British towns of Bolton, Birmingham and Leicester all set to participate in a mass rally at Wembley to highlight the vulnerability of their community in India to attacks from Hindu extremists.
Last year's anti-Muslim violence started after a mob attack on a train in which 58 people, mostly Hindus returning from Ayodhya, were burnt alive.
The revenge killings, which continued for the next three months, had prompted Amnesty International to criticise the Gujarat government for not doing enough to protect the minority community.
Relatives of three British Muslims from Yorkshire, who were killed while they were visiting friends and family in Gujarat, are expected to be among the protestors at Wembley.
Mohammed Aswat Nallabhai, Saeed Dawood, and Shakil Dawood were travelling in their jeep when they were attacked and killed by rioters. Their driver was also killed, but a fourth member of the group, Imran Dawood, managed to escape and returned home to Yorkshire.
Saeed and Shakil Dawood's brother, Bilal, said in a statement: "We just want a proper investigation or a reinvestigation to happen. We just want to know what's happened, who's done it, and why it's happened, and the right justice process to be followed. Modi is in charge of Gujarat state, so...he is ultimately liable.
"If the UK police, Jack Straw and Tony Blair say they are willing to send Scotland Yard and Yorkshire police out there to assist, I don't know why Modi is unwilling to take those options on."
Ibrahim Sacranie, secretary general of the Muslim Council of Britain, said: "As chief minister, Modi was supposed to calm down the fervour, but he threw further petrol into the fire. God forbid if he were to repeat those sorts of statements here.
"We are concerned because here in the UK we have an extremely good relationship between the Hindus and the Muslims. We work together in a number of areas. There were some concerns at the time of the conflict in Gujarat and since then we have worked over time to make sure our communities are not affected by what happens overseas.
"This harmonious relationship has played an important role in common good and welfare of the country. It's a worry when a certain individual who has been known to incite hatred or make inflammatory statements comes here."
