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Thanks for the replies. Squad, I have never smoked and have always had a good general health (apart from the chest infections). I had a chest X-ray about 4 years ago which showed nothing and came back normal. I will do as Dr b advises and ask for a blood test. ACtheTROLL, sounds like you've had a bit of a nightmare.
What I really want is to be referred to the Ear, Nose and Throat Clinic, but knowing how reluctant doctors are to make referrals these days I don't hold out much hope. My Dr gave me an inhaler (brown one) which he said should surpress the tickly cough. That hasn't done much.