Could Rosyth support today's Royal Navy?

Could Rosyth support the Royal Navy as it exists today?

Yes, it has suitable support infrastructure for the smaller modern fleet, although much of the Royal Navy is based on Scotland's west coast.

Rosyth is judged large enough for the current fleet and already has the infrastructure needed to support it. That differs from Scapa Flow, where a modern operational base would require major new transport and service connections. The earlier First World War comparison explains Rosyth's advantage: repair, refit, and supply networks mattered even when the whole Grand Fleet could not fit there. Much of today's Royal Navy is based on Scotland's west coast, however, rather than at Rosyth.