We do the home service when/if asked and reset service interval using the manual method on the car, this resets the oil dilution etc back to 0% etc and then we have a full annual service at the main dealer based on age even though the car doesn’t say it needs one.

I suspect most people suffering with oil dilution issues only need servicing on age rather than mileage. We’ve only got 55k on our 15 plate for example! Sold - Bell a 2015 MY16 Loire Blue Autobiography 4.4 SDV8
Previously George a 2007 MY07 Java Black VSE 3.6 TDV8
Previously a 04 MY04 Defender 90

Are more frequent oil changes also recommended for the 2l engine (P400e)? 2018 P400e AB LWB

The P400e is a petrol engine and does not have a DPF so should not suffer normally from fuel dilution.
Just follow the service request on the Incontrol app or on your dash 2018 SE SDV8 4.4 Byron Blue