How we got here: events leading up to Nadhim Zahawi’s sacking for breaching ministerial code

Timeline: from the initial HMRC investigation to Rishi Sunak's ethics adviser saying former chancellor was guilty of breaking code of conduct

• Nadhim Zahawi sacked as Tory chair

Questions have surrounded Nadhim Zahawi's tax affairs for months and the row came to a head on Sunday when he was sacked as chair of the Conservative party for multiple breaches of the ministerial code.

The controversy centred on a tax bill over the sale of shares in YouGov, a polling firm that Zahawi co-founded. The shares were worth an estimated 27m and were held by Balshore Investments, a company registered offshore in Gibraltar and linked to Zahawi's family.