Lucky you. It'll still help though.
I wasn't kidding about using my coolant heater 3/4 seasons.
I also put mine on a remote control, so I could activate it ~an hour before using the car (I don't commute, so not on a "timer friendly schedule"). Mine is 800 watts though, and an hour is plenty for my little 1.0L engine. I suspect the Micra's isn't as powerful if it's the frost plug style.
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View my fuel log 2015 Micra S manual: 5.0 L/100 km ... 56.5 mpg (Imp) ... 20.0 km/L ... 47.0 mpg (US) ...