John has a broad-based practice in chancery and commercial law, acting in a wide range of work including contractual, property and professional negligence disputes, together with commercially related judicial review claims.

The 2009 Chambers' UK Guide describes him as a superlative silk [who] provides clear, sound, commercial advice and has a proven ability to get to the crux of contractual disputes very quickly" and a completely
outstanding practitioner due to his extreme versatility and brightness of mind. John is a team player who quickly establishes good working relationships with both professional and lay clients.

John was Head of Chambers from 2001-2004, and Chairman of the Midland Chancery and Commercial Bar Association from 1996-1999. He is a Bencher of Lincoln's Inn, and a Visiting Fellow of the University of New South Wales.

John is ranked by Chambers UK 2011 under Chancery and Commercial Dispute Resolution and is described as being a chancery mega star and for providing a first-class service from beginning to end. John is commended for his "excellent commercial judgment and a fantastic legal mind" and is "universally recognised as the leading commercial silk in the Midlands".