tornadoken said;
No. 1959 procurement, driven by perceived need to lift Blue Streak. No more than 10 needed. Retained after demise of IRBM as make-work for Short's and value for Bristol (wings) in merger into BAC. RAF's 1964 wish for C-130H was to dump Argosy, ordered in 1959 when RAF had wanted C-130E. Need for IMF Loan was 1965.
Cheers.