Serious breakdown at high speed a couple of days ago traced to a faulty crankshaft position sensor. Engine totally died and just managed to get safely off the road. Obtained a new genuine Renault part from Fischer Brothers (aka Renault Parts Direct) for £65 all in and took less than an hour to replace (F4R engine, 2010 with 92k on the clock). Well worth replacing if you have an older Clio as a safety precaution.