How plausible is Britain licensing the ShinMaywa PS-1 and later the US-2 as its replacement?
Short answerUnlikely; it would require a major change in British procurement thinking.
NotesThe counterfactual asks Britain to license the Japanese ShinMaywa PS-1 and later buy or build the US-2 as its successor. That path appears unlikely because it would require a major change in British thinking, rather than because of a stated technical barrier in the aircraft. The obstacle in this brief answer is institutional procurement preference. Operational merits and detailed costs remain unresolved.