Dr Farooq Bajwa, the boss of the Mayfair law firm fighting for Begum’s return to the UK, was fined for claiming more than double the agreed amount in legal aid for a case last year. He said he had “very little experience of criminal defence work” after he claimed £7,300 for the National Taxing Team despite agreeing to a £3,000 cost limit.
Dr Bajwa was fined £2,000 and forced to pay £9,500 in costs to the Solicitors Regulation Authority in May last year.
The case means any attempts by the 19-year-old to claim legal aid with Farooq Bajwa & Co would be subject to extra checks and regulations by the SRA.
Farooq Bajwa & Co defence solicitor Tasnime Akunjee has been representing the Begum family since 2015.
But he passed on the teenager’s case to Ms Peirce, once described as the lawyer of choice “for every accused jihadist and IRA suspect”, last week.
He said they could not take instruction from Begum after he blocked from entering a Syrian refugee camp to meet her.
The SRA said any attempts by Begum to claim legal aid through Mr Akunjee would be subject to stringent checks.
But Ms Peirce took on the case last week after applying for legal aid on behalf of the ISIS bride on March 19.
The Oxford-educated solicitor – who made her name representing the Guildford Four and Birmingham Six during the Northern Ireland “Troubles” – is known to some Arabic-speaking clients as al-Umm, meaning mother or “the greatest”.
She is now best known for representing Islamist cleric Abu Qatada, but has argued on behalf of other terror suspects including Moazzam Begg, a British Muslim held at Guantanamo Bay and the Tipton Taliban, also held in Cuba, who were released without charge after being repatriated to the UK.
Ms Peirce, 79, has also represented the family of Jean Charles de Menezes, the Brazilian mistaken for an Islamist terrorist and shot dead by police at Stockwell Tube station, and the Wikileaks founder Julian Assange.
In 1999 she was awarded the CBE for services to justice but later returned the honour saying there had been a misunderstanding and she had never meant to accept it.
Express.co.uk has contacted Farooq Bajwa & Co for comment.