Derek Davidson (who used to run Airbourne at Bournemouth, but has now retired) is a CAA Examiner and still teaches. I'm sure that he may be able to help. His Tel No is 01202 775821 / 0783 517428; he still advertises in Pilot Magazine and says that he specialises in completions. He's a very laid back kind of guy but will tell you when you're getting it wrong (I've known him for around 5 years since finishing my PPL in the UK and flying in his club).
Email me if you need more info.