With regards the shipyards on the Clyde, there is a long story there that goes as far back as 2012 - 14, where I believe that the shipbuilder put forward proposals for a 'Frigate Factory', but UK PLC stated "NON ! " & wouldn't put any funds forward in the form of assistance.
The costs of dismantling over 100 years of shipbuilding (in the form of some of the buildings), also ended up with local Government stepping in & stating some facilities are 'listed buildings', so it's likely taken the shipyard finding some funds, as well as arranging planning permission to be in place, BEFORE actually striking a blow on the development