My Petrol 1.6 2010 registered Zafira always fails to start on the first turn of key, but guaranteed to start every time on second turn.. any ideas please?

Every time in the morning particularly, so from cold the car will never start with the first turn of the key, but turn the key again and it always starts. Question is why won't it start the first time? There is no engine light or fault codes stored. It's irritating to say the least, so any help or advice would be gratefully received. Thinking out loud could it be Spark plugs or Coil pack or both, I have no idea when these were last changed, the service record is only stamps in the book no description of what has been changed. The car has only completed 55k miles.