John Major has a reputation as being fairly boring as Prime Ministers go, so I got to wondering what sort of point of departure could you come up with after his becoming PM to most decisively change that? One idea I had was his deciding to launch a military intervention in Rwanda during the genocide and publicly call it such. So the immediate question is did the UK at the time have the capability to send even a small-ish force? Aside from that you need the diplomatic heft to get at least one neighbouring country to allow you transit, which considering how messy the regional situation was could be interesting.