Simon how much do you charge? ie at an event? Full day, email or PM me if you prefer.
It really depends what you are looking for, Don's tutition is mainly about the dynamics of driving and the driver, focusing on creative car control, very informative, very relaxed, and is done in your own car at Bruntingthorpe. Some peeps really rate him, some don't, he is very black and white.
Andrew Walsh
www.1stlotus.com IIRC charges £140, based at North Weald is an excellent instructor, ex Benneton F1 Test Driver.
With all due respect to the tutition I have had on track which was fantastic from various instructors, it only really helped me develop my skills with regards to turning in, braking, car position, track etiquette, racing line.
It didnt teach me, how to trail brake, left foot braking, slip angles, heel and toe, oversteer, understeer, tyre pressures, car set up, all very important to know and understand, I wouldnt recommend learning this on track, best left to an open airfield IMHO
If you understand what your car is doing it and why, then the speed will flow naturally.
2 types of coaching available, what you looking for?