To quote Secretsooty
I was told by one of the senior engineers there at the time that they were a modification to the original design spec, insisted upon by the then-current government as a condition of the financial assistance given to the project during it's "floundering" period. Their purpose, it was assured, was for the attachment of either a form of bomb-bay structure or external stores carriers
Crikey, a Civil registered aircraft that can be adopted to military usage at short notice, can’t see that happening……….hang on though.
Working on the Victors in the Late 1970s Operation T aircraft would return and on occasion the crew would mention the "intruder" was a Concord