How Britain might base 22 SSNs and 40 conventional submarines

How would the Royal Navy use and base 22 Astute-class SSNs and 40 Upholder-class conventional submarines?

Refit the Upholders and spread them among regional bases, while concentrating most Astutes in Britain and possibly a seven-boat squadron in the Falklands.

The proposed basing plan begins by sending the aging Upholder-class boats through major refits. Conventional submarines would then be distributed among Britain, Gibraltar, the Falklands and Singapore so they could cover local duties without consuming SSN time. Most Astute-class boats would remain divided between Faslane and Devonport, with a third squadron potentially based in the Falklands for South Atlantic and Pacific access. Propulsion type, maintenance infrastructure and patrol geography shape this scheme more than simple numerical equality.