If you phone the kennel club they will give you a few names, there is one lady who is red hot but i can't remember her name but i know the kc know her very well.
I've recently heard of this law firm: Wheldon Law - Specialist Canine and Criminal Lawyers www.wheldonlaw.co.uk Wheldon Law are Solicitors specialising in criminal cases and dog Law. Legal aid maybe available and we operate a free 24hr police station advice and assistance scheme and we defend clients in police stations, magistrates courts, youth courts and in Crown Court cases.
I've no idea of their credentials or reputation but they are willing to take on cases which fall under the DDA.