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I'm back. Thanks everyone for all the advice. Easy one first, mm no option comes up when I click on the item I'm afraid.
Ducksie, Smow and Ryzen I had thought of that but worried it may complicate things. OK I'd have a new add but I would still have the problem of the old one and being charged for a sale that was cancelled, wouldn't I?
I suppose I can't do anything unless and until I get charged and then I can raise a complaint. Perhaps wait and see is an option?