A British SSGN force built from SSBN hulls

With a blank cheque for UK defence, what would you do with the nuclear-deterrent force?

Keep the SSBNs and add four related SSGNs with vertical-launch inserts, creating an eight-submarine strategic pool with both deterrent and conventional strike roles.

The proposal retains the nuclear deterrent and adds four submarines based on the same hull class but configured as SSGNs. Vertical-launch inserts in the missile tubes would give them a large conventional strike load without creating an entirely separate submarine design. Together with the SSBNs, they would form an eight-boat strategic pool and broaden the number of trained crews available across related platforms. The SSGNs would be a distinctive British contribution that allies could not easily duplicate and a force multiplier comparable to carrier aviation. The concept links industrial commonality, crew depth, and alliance value rather than treating missile capacity alone as the objective.