From the Wikipedia article on Fort Bovisand:
Recent Use
In the early 1970s the fort was converted into an important national commercial diving school and scuba diving centre, which flourished for many years, but at last got into difficulties, and disagreements among its management.
By 2000 the main leaseholder Fort Bovisand Underwater Centre went into liquidation, but the other diving services trading at Fort Bovisand kept on trading, and the accountants managing the liquidation encouraged this to preserve the value of Bovisand as an asset, particularly because Fort Bovisand diving school had a world-wide reputation. There followed months of argument about the status of the leases and viability of existing businesses based there.
In December 2000 Marine Contractors Ltd (one of the main businesses based there, and one of the parties negotiating to take over the running of Fort Bovisand) went into receivership. As a result the owners (the Ministry of Defence) decided that it was no longer possible to keep the site functioning. The accountants acting as liquidators for the owners obtained a court order for possession and changed the locks and evicted the remaining diving etc firms trading there.
On 13 January 2003, news said that Fort Bovisand was likely to be sold on the open market, but that accountants Begbie Traynor were still interested in hearing from businesses, including diving concerns, who might want to take it on.[1] By Mid-2005 ex-BBC boss Greg Dyke and local property developer John Steven owned Fort Bovisand and had plans to set up a new business there.