Further to the brief post yesterday, I received the following information from Viv head.
David Brady retired from BTP in May 2013 and sadly passed away on the 6th December 2018. David was an Inspector based on London South (LS) Area Custody & ID Suite at Ebury Bridge. Prior to that he worked at Holmes House in the LS Core Team and was a temporary Inspector at Ashford prior to his promotion.
David is survived by his wife Jackie. Funeral details to follow once confirmed.