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Thank you for your response. I apologise for not being clearer in my first post but what I want to be able to do is to selectively retain the jpeg data and delete the RAW file on an image by image basis in-camera. I will be on holiday soon and will not be able to download any files for two weeks so there could be significant space advantages if I could do this to free up space where I consider the image may be worth a 'snapshot' but does not warrent RAW storage.
Then you have two options for that, 1) to have extra card or a tank(data storage tank) to carry. 2)is keep deleting the images you don't want. If you have shot the images in basic as well as Raw mode then look for the image info and then decide the image to delete or not. Thanks Hope this will help you. Have a good holiday break.