Hi tap32. Thank you SOOO much. That solved it. The reason I didn’t do this before was that just before upgrading to Yosemite etc I had done this. However, when you said that it made me wonder if the keys work differently in yosemite. No idea if they do, but I revoked my production certificate and regenerated a distribution provisioning profile. Installed that and Bob’s your uncle it worked! So thankful, that was driving me potty.
For others’ benefit, these were the steps I went though (approximately):
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Running Mountain Lion and whatever XCode was on there
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Had loads of issues uploading to apple
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Revoked and regenerated profiles etc
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Upgraded to Yosemite, the latest version of XCode etc
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Still had problems (see above)
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On tap32’s advice, revoked the certificates again
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Uploading now works
Thanks again and good luck everyone. The force may need to be with us at the moment I fear!
D