Drop me a line at LabanB@excite.com, with more precise location than York, and I'll see what I can come up with.
You have Pat O'Malley in Ossett, Wakefield, Ian Thompson in Leeds and myself in Newcastle upon Tyne for starters.
I'll be hosting Grand Tuhon Leo Gaje at the end of May for his very first UK seminar. His system (Pekiti-Tirsia) is world famous for its effective knife fighting element.