Dont you just love it when .. .. ..
the engine gives that slight cough or misses than small beat, and then purrs away for the next few hundred hours. Of course you never find out why, was it a few drops of water in the fuel, a plug playing up, something else. It always gets the attention - doesnt it, even in a twin, but the more so in a single especially over the sea or being vectored onto the approach in unpleasant weather.
Happy days.