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lynx-
Very good point. Modern highly pressurised systems are different.
@Trunkie since it's a 1.2 puretech engine it will have a bleed screw on the thermostat housing, but the cap open will still work to quickly get the level right.
Be careful though, I don't think these engines are very tolerant of any overheating at all.
TRA
Most likely you will have air in the system. You would ideally refill with coolant and idle the car without the cap on while the air burps out of the tank. Once that settles top up again an replace the cap.