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@LaQuelda
mdpye, it's a wee while since there were any posts on your thread, so you may have sorted out the provenance of your Cyclone to your satisfaction. However, my comments, for what they're worth: On the basis of the style of finish and the frame number, you have there a 1974 or 1975 Cyclone. My money would be on 1975. My 1976 Mistral is 43495 - date is certain, I've had it from new - and you have already tracked down 1974 Mistral 40611 on the web. nuovo_record correctly points out that Cyclones were dropped after 1975. From WW2 until c.1977 Holdsworth frames were sequentially numbered from c.6000 to c.44000 (with the slight complication that up until 1965 the Holdsworth 'shop' were issued with batches of the number sequence by the Holdsworth 'factory' - from '65 the shop started their own numbering system). The style of the 531 decal suggests an even earlier date than 1975 and is certainly pre 1977 but, assuming Holdsworth's frame numbering was fairly consistently sequential, I would still say late '74 or 1975. The single model name swag on the top tube does seem to have been a mid seventies thing. Earlier machines had a swag on each side but my '76 Mistral just had the one on top, like your cyclone. Later they went back to two model names on the tube sides but no longer used the swag style.
BTW, I use Bob Jackson for my frame finishing. I find their work good value although their courier charges are not the lowest. You'll find refurbishment costings on their website and these seem to turn out accurate in practice.