I don't train with, nor would I recommend, someone who just knows a few moves.
My first recommendation would be Mr Terry Barnett, who is just outside of London, in Hertfordshire. Terry is a Full Instructor in FMA with over 30 years experience and is considered by many, including Guro Dan Inosanto, to be one of the best Panantukan teachers in Europe. I have trained with Terry for aprox 5 years, and can tell you from experience that his Panantukan is first rate.
Have a look at his website:
www.integratedarts.co.uk
There are others in and around the London area, but if you want the best then start with the best. I hope this has helped.