I have done as Dean suggested and had the lens off and on several times, with no problem. I also have a Nikon D40 and I have tried interchanging the lenses several times. Again, no problem with either camera, so I am becoming more confident that it was a once only problem.
As regards the warranty, I don't know why I don't have a Nikon warranty. Simply cover all their stuff with their own 12 months warranty. I have no reason to suppose there is anything shady about the product - it came packed in a box with all the proper bits and pieces and looking very authentic. I wonder if it is a grey import - the price was very good, which was why I went to them.
Thanks for your help
Sam
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