This morning, after having driven 30 miles and parked, my 2009 Nissan Micra Visia wouldn't start. I turned the key but there were no electrics - no display, no radio, no electric windows - no engine turn over - nothing. However with the key in the on position, gradually the display flickered and more and more electrics came back. 90 minutes later the radio returned and the car turned over but wouldn't catch. Ten minutes after that it started (just as the RAC turned up). They tested the battery and it was fully charged. The car ran perfectly the 30 miles home and has started again. What happened? It is an LPG conversion by the way and was serviced four weeks ago. It has travelled 110k miles