An update. I got an adaptor from Argos which works fine. I hadn't thought of Argos initially although it has a store in my town. I literally ordered it and picked it up about 30 minutes later
I would still be interested in answers to my questions above on what leeway if any there is between 650mA and the stated 800mA required The question about 7 D batteries only adding up to 7.2v and not 9v but working OK and how one works out what mA these batteries give
Thanks
Mike
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