It was an interesting experience, after analysing my putting stroke, he said there was nothing wrong with the putter I was using, so no attempt to sell me something new. My problem seems to be lack of control of the putter, this was what I have thought myself. tried some thicker grips which seemed to help then he suggested I use my normal wood and iron grip on my putter, he also suggested a moe upright stance. These seemed to feel a lot better so its off to the practice green to see how it goes.
Dave it cost £49 for a hour's session.