Scenic Privilege 2.0 petrol auto poor starting

I have a 2010 Scenic Privilege TomTom 2.0 auto petrol which starts fine all Sumer but when Autumn/winter arrives it plays up. Sometimes it fires and stops and then takes a lot of attempts before finally starting and sometimes it wil start and run ok but refuses to rev for 5-10 seconds then suddenly will go ok. Once started it runs absolutely fine all day. Autumn is now here and the problem has just returned. Any ideas please?

Scenic Privilege 2.0 petrol auto poor starting