I assume the Clifton no longer pays RSGB fees, so it is not an affiliated society and, therefore, is not on the list of clubs you can enter on behalf of. I sent in a log obo the RSGB contest club as I don't have any other affiliation.
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It was nice to work with you today - I haven't done RTTY for many years, and I didn't intend to today, but I ended up setting up during the contest and was only on for the last hour. 89 Qs at my end wont win anything!