 He was commissioned by the Solicitors Regulation Authority (SRA) to undertake a comparative review of how the SRA has dealt with disciplinary cases and especially the over-representative number of black and ethnic minority solicitors that are sanctioned by that regulator, John's report being published in 2014.John made a submission to the United Kingdom Parliament's 2017 Youth Violence Commission, which he subsequently published in digest form.In 2019, John quit from an advisory body to the Church of England, after Archbishop Justin Welby endorsed the criticism of Labour Party leader Jeremy Corbyn by the chief rabbi Ephraim Mirvis, making allegations of antisemitism.