Rishi Sunak today swiped back at Sir Keir Starmer after the Labour leader sought to revisit a row over the tax arrangements of the new Prime Minister's rich wife. As he faced Mr Sunak at Prime Minister's Questions for the first time, Sir Keir demanded the new premier 'put his money where his mouth is' and abolish the non-dom tax status. It comes after a controversy earlier this year when Mr Sunak's billionaire heiress wife, Akshata Murty, pictured together, inset, was revealed to enjoy the tax perk. This meant she was able to legally avoid paying a huge UK tax bill - estimated to be as much as £4.4m last year - by paying £30,000 a year to register as based in India. After the row threatened to harm her husband's political career, Ms Murty promised to pay UK tax on all her worldwide income. She is the daughter of N.R. Narayana Murthy, the Indian billionaire founder of IT giant Infosys.