Usually my car idles at about 500 RPM but has started to idle slightly higher at about 800 or 900 RPM like it is still warming up even when the car is warm, it makes it a bit less smooth , has anyone else had this and any idea what it could be?.

Is your aircon running a lot in the warm weather or is there an air leak on the suspension that might cuase the suspension compressor to run all the time? Are you running a portable fridge in the boot, or any other accessory that might be putting a load on the alternator? 2018 Mini Countryman Cooper S E All4 PHEV in Melting Silver - it’s whisper quiet in EV and polluter modes

The Air Suspension seems fine and to be functioning normally, I did have the A/C on earlier though, but that hasn't happened when I've used it before, the only other thing I can think of is I did have the TV on with the car switched off earlier for about 20 minutes