Why the Royal Navy does not need Japan's new FFM

Would Japan's new FFM be useful to the Royal Navy?

Not enough to justify a new production line because Type 31 and Type 26 already cover Britain's principal frigate needs.

Japan's proposed FFM overlaps with the light-frigate role already assigned to Type 31. Opening another British production line is judged difficult to justify when an existing program meets that requirement. Type 26 covers the larger frigate role for which other navies might consider FREMM, so the two size categories need to be distinguished. The discussion expects subsequent light frigates to develop from the Type 31 design pattern, without presenting that expectation as a settled future program. Systems cooperation remains a possibility, while views differ over whether later hull procurement could become multinational: the Horizon experience is offered as a reason for British reluctance.