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Whirly551, welcome.
Would you care to elaborate on who your father was?
As you may have read, I am involved in sponsoring a website detailing the history of Ferranti Helicopters (and a number of additional operations including Alan Mann and BCalH) and so your father's reminiscences would be most welcome!
At this stage we are still collecting material with the view to launching the site 'sometime' this year.
Rgds
S.