Sir Laurie Magnus is conducting an investigation into whether Angela Rayner broke ministerial rules by failing to pay the correct amount of stamp duty on a new home, and his findings could be revealed as soon as today.

Her case was thrust into doubt late on Thursday when the conveyancing firm - Verrico & Associates - said it did not provide advice and had been made “scapegoats” in the political row.

Its managing director, Joanna Verrico, told The Daily Telegraph while it had acted for Ms Rayner when she bought the property, no tax or trust advice was provided.