 Singh undertook pupillage at the barristers' chambers 4–5 Gray's Inn Square where he became a tenant in 1990.He remained there for 10 years specialising in public and administrative law, employment law, European Community law, human rights law, commercial law and media law.Soon after he was made a tenant, Cherie Booth QC also joined 4–5 Grays Inn Square as a tenant from another set.