Standard terms for a consultant and VERY enforcable.Large firms will throw their weight around because it costs them nothign to point a lawyer already on retained in your direction.Small firms will com after you because every £ counts to them, and it will generally be easier for a small firm to show that you were personally involved in stealign the client.If you go ahead and do it, and you get sued, then (no offense) you desreve what you get