Earlier in the thread we touched upon John Crewdson's trips out to 'Sealand' in the North Sea. It seems however that he was not the only one to venture onto these decommissioned forts as in 1990 the Port of London Authority chartered a Twin Ecureuil to do something similar:
An AS355F lands atop decommissioned 'Maunsell Fort' G5 in the North Sea in 1990 (apologies for the atrocious image)
Evidently the Port of London utilised a fort which was formerly part of Radio Sutch's 'Shivering Sands' facility. The PLA maintained the 'G5' searchlight fort for their remote 'wind and tide' gague.
I flew once with Bristow's SAR team from Lee-on-the-Solent (this would have been mid-90's .. S61) and the driver pointed-out some sort of concrete facility off the south coast (a small ex-WW II installation) and which was equipped with a helipad. I think the facility had been converted to a home (of sorts).