Thank you @Rosettastone57. I phoned the radiography department at the hospital where she is due to have the scan to see if they had any suggestions about getting . They said try your GP would like this done, so we're going with that, and it's all routime, no questions asked, no one will know etc and see where that gets us. Both my brother and I think the nurse at the memory clinic could have got mum in if she'd just sat down and started chatting generally. Mum loves to chat and I'm sure she could have persuaded her to have some more formal tests if the nurse had tried being friendly. As it was as soon as she saw mum was refusing she backed off. I didn't think the fact that the nurse told me that dementia would get mentioned was helpful either. That will really give mum the jitters, as she has threatened suicide if anyone tells her she has dementia.