Campaigners, including many church groups, have been encouraged by a study that an amnesty for many of the 600,000 illegal migrants in Britain could provide a £3 million boost to the economy.

For the first time, services will take place at Westminster Abbey and the Methodist Central Hall (opposite the Houses of Parliament) at the same time, celebrating the place of migrants in modern British society.

In what is set to be one of the largest ever Christian expressions in the public square, thousands are to attend simultaneous services celebrating the place of migrants.

The Liberal Democrats yesterday responded to a call by many Christians for an amnesty for illegal immigrants.

Thousands attended a Mass and rally in London yesterday, to celebrate immigration and call for an amnesty for illegal immigrants.

Thousands are expected to take part in a special church service next week to celebrate immigration and call for an amnesty for illegal immigrants.