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In 2023, the select committee launched an inquiry into the probate system, but it was cut short by the election.

In May, the justice select committee said the organisation had shown an "inability to learn from its own mistakes" on Ms Kneller's watch and called for her to go.

A list of the Labour MPs who have signed it – which, the BBC has been told, includes 10 Labour select committee chairs – is expected to be published on Monday evening.

USC said in a statement Friday that it is “cooperating with the select committee’s inquiries and are following all applicable privacy laws and other legal protections.”

Among those backing it was Ruth Richardson, a former finance minister for the centre-right National Party, who told the select committee that the proposed legislation was "a bill of consequence whose time has come".