Four New Square pupil reprimanded by BSB after drug arrest

Trainee barrister Henry Mostyn, who secured a sought after pupillage with 4 New Square, has appeared before the Bar Standards Board today accused of “engaging in conduct that is discreditable to a barrister”.

The pupil has been allowed to stay at the set despite his arrest for carrying cocaine and ecstasy tablets just two months after being offered pupillage. He was cautioned by police, leading to the BSB investigation.

The former Eton pupil, who is the son of family judge Sir Nicholas Mostyn, was reprimanded by the BSB for his lack of judgment in choosing to take drugs. As an undergraduate he read mathematics at Pembroke College, Oxford. He was called to Middle Temple in 2011, where he is a Harmsworth scholar.

Trainee barristers can face fines for misconduct on a par with fully qualified barristers, unlike solicitors where trainee misconduct is dealt with by the SRA.

The set declined to comment, Mostyn could not be reached for comment.