Former British prime minister Tony Blair is to give evidence before a parliamentary investigation into the On-The-Runs scheme for fugitive IRA members, an official has confirmed.

Mr Blair’s Labour administration sent about 200 letters to republicans assuring them they were not being pursued by UK authorities following requests from Sinn Féin.

An investigation was opened by British MPs when the prosecution of a man for the murder of four soldiers during an explosion at Hyde Park in 1982 was halted after he received one of the letters in error.

The OTR letters scheme began while Mr Blair was prime minister and the chairman of the Northern Ireland Affairs Committee has said he is one of the most important witnesses to the inquiry.

A spokesman for the committee said Mr Blair had confirmed he would be attending a sitting next Tuesday 13 January.