The Excel centre in London is being donated for use free of charge by the Abu Dhabi Royal family this deal is still in place the only things removed into safe storage are the beds and equipment which if required can go back. The hospital remains under the control of St Barts. It hasn't gone anywhere.
Thats not the case with all of them though, and they have all been mothballed as i understand. So regardless the national plan will be different, but that's great they have given the use of the building, its also good they can reopen at short notice, but if they haven't got enough staff to run the hospitals, and they haven't by a very long way at the moment. At the start of this pandemic the NHS was understaffed by over 100,000 people. now if you add that some NHS staff will have tested positive, or have family at home and need to isolate, it paints a picture of how acute the current shortage is and the staff are best placed in the actual hospitals than in a recovery setting as they have been used.