The National Crime Agency has taken the first step in Britain in a corruption case embroiling ex-City minister Tulip Siddiq, by freezing any future sale of her mother's home.

The agency – hailed as Britain's FBI – last night confirmed obtaining an asset-freezing order on the luxury property in Golders Green, North London, which has been the Siddiq clan's main home for 14 years.

Hampstead Labour MP Ms Siddiq's mother Rehana, 69, has been living there since it was bought in 2011 for £1.2 million.

The home, registered in the Isle of Man tax haven, was bought by millionaire Ahmed Shayan Rahman, 42.

He was a chairman of the British Asian Trust, a charity founded by King Charles. Last night the trust said he has stood down over the NCA probe.