An update has been issued via UK Defence Journal -
https://ukdefencejournal.org.uk/bae-...ing-yard-fire/
It sounds like the fire was contained to one section but no indication as to how much delay will occur.
”pr00ne”, you strongly defended the Barrow facility but, an event like this shows how desirable it is to have an alternative assembly location to minimise ongoing disruption. The facility that is planned at Osborne in South Australia will occupy a larger land area and will have the capability of building all sections of the submarines except for the reactor and associated systems. Barrow & Osborne will be working together under BAES management as directed by the respective Navies and their governments.