As someone whose livelihood is dependant on shipbuilding in the UK, I take what is being stated by the report with a large pinch of salt.
It is obvious that BAE has what some would call a dominant stranglehold on Military shipbuilding in the UK.
However, if you look at all the Military & pseudo-military (read as RFA's) contracts that have been produced in the UK since the formation of the business back in 1999 / 2000, there have been many choices made / different yards used & like it or not, BAE has been the one that has pulled most of these contracts to completion.
YES, they are not perfect (thank goodness, or I'd be out of a job !), but neither are the various 'competitors' who could attempt to fulfill the task, or for that matter Govt's that have controlled the purse strings, demanded that particular equipment be fitted & then complained that the shipbuilder is at fault, when the ships are delayed due to problems with fitting untried & untested systems into a new ship.
The idea of building 'parts' across the UK & shipping them to a central assembly point may seem like a great idea, but the logistics & individual contracts with each yard are a nightmare, the quality will be 'restrictive', with the costs probably outweighing the same ship being built from scratch in one place.
I personally would love to see Type 31 being developed & built in the UK for export customers across the planet, but no two customers want the exact same thing & while a hull-form can be common, tying x5 different combat systems (& the variations of guns / missiles / radars), to x7 different powertrain variants, to a ship that only needs to be crewed by 80, but is able to take 160 is a design nightmare.
Type 31 will succeed as an export variant, but only if it is sold as a set of plans to be built in-country, by the nation that wants it & whom adjusts the equipment to suit themselves.
SA