An ex-Clifford Chance partner has written to the Solicitors Regulation Authority calling for the body to update its guidance on ‘SLAPP’ (strategic lawsuits against public participation), after he was threatened with legal action by lawyers for the U.K. Chancellor of the Exchequer Nadeem Zahawi.

Dan Neidle, who left Clifford Chance in April after 24 years with the firm to found the non-profit Tax Policy Associates, tweeted letters sent to him by law firm Osborne Clarke on behalf of Zahawi.