"Great to see real ships being built on the Clyde again. Stupid attitudes of both owners and unions wrecked the industry there in the 70s"
Think you have confused merchant ship construction with warship building. The former remains just about dead in the UK. Yarrows, as was, was nothing to do with John Brown/UCS. Since the sixties it has built County Class Destroyers, Leanders, Type 22 and 23 Frigates and the Type 45 Destroyer. By the time of the latter it had been Nationalised, Privatised and eventually taken over by BAe. That it has become the sole remaining Yard able to build Surface Warships is due to the fact that we are not as yet prepared to order enough to justify the creation of further capacity. It is true that BAe now builds under cover on what was once part Fairfields in Govan.