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@anidel
Actually, from:
http://www.retrobike.co.uk/forum/viewtopic.php?f=12&t=362572
and
http://www.classiclightweights.co.uk/designs/hsholdsworth.html
It seems to be a 1950 Sirocco, before it was renamed Whirlwind.
But, according to the second link, towards the end, that headbadge is thought to be introduced in the 1955. But according to the Excel file, that frame number falls around 1950.