John,
Guro Bob and Terry have been friends and training partners for over 30 years, they both came up under Guro Inosanto and are both full instructors. Guro Bob's Panantukan is also superb, Terry was my first recommendation as I have spent so much time with him, as opposed to Guro Bob who I have only had the fortune to train with on a few occassions. Guro Bob is closer to you, his Academy is based out of Hoxton Square, N1. I of course recommend him to you also. Have a look at
www.bobbreen.co.uk
Your question on knife defence is a whole other world of discussion John, and the best approach (if one exists) is not exclusive to one particular art. What I will say is that Guro Bob Breen has an excellent reputation for teaching knife defence, so I would recommend him in this area also.
Good luck
Michael