Hi thanks for all your suggestions and support. Well I have been out to the car this morning in the hope that it would be miraculously fixed....... of course it isn't however. It didn't even give me a glimmer of hope by being silent for a minute or two.
I followed K9d's advice with WD40 and like but didn't really hit the tensioner to well, prob more on the belt but it did go deadly silent for approx 10 seconds and then started up as before. Surely this would indicate that it is the belt which is somehow making the noise????