 It was publicly exposed in a demonstration held there by the West Midlands Committee of 100 in the summer of 1963.Under later Home Defence schemes the bunker was designated a Sub-Regional Control (S-RC 91) in July 1963, Sub-Regional Headquarters (SRHQ 9.2) in the 1970s and finally a Regional Government Headquarters (RGHQ 9.2) in 1982.For this last role, the site was greatly modernised in the early 1980s, although only around half of earlier RSG facility was designated for use by a reduced staff of 134.