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MI5 files released on Tuesday reveal that plans were drawn up in the late 1940s, for the "detention of subversive individuals in the event of war." Following initial discussions between the Security Service and Whitehall Departments, Rhyl was identified as a location for one of three UK camps.
It would have been used primarily as a transit camp.
The other two sites in the original plans were at Ascot and Epsom.
The proposals were for the majority of detainees to be sent to more permanent locations in two holiday camps on the Isle of Man.
Originally, it was suggested that the camp at Rhyl could house 500 detainees, but the scale of the plans soon doubled - with over 900 males and 100 female prisoners.
This would have required a staff of over 130 - with the warders or "Discipline Staff" to be sent to Rhyl from Lancashire and West Riding.