This afternoon and probably still ongoing, although the Grad are on it.
Okay a bit tongue in cheek on my part, but hey seriously!! How soon could the RAF have put an "umbrella" over downtown Libya this Sunday afternoon? (Stands to be put in place here but I'm guessing we have on a Sunday afternoon absolutely nothing sober from the RAF that could have helped if it had got nasty).
Royal Navy evacuates Britons from Libya amid fierce fighting | World news | The Guardian
(Its 2649km from a point in Northern England, near the Yorkshire Airbase I have I mind, to Tripoli. According to Google Maps anyway- have we got an aircraft in the RAF that can fly, loiter, drop a bomb - do something useful, and then get back to the UK?)