Ordered Premium Plus October 2020 and confirmed by Mercedes November. Told it would be March 2021 as it would be the 2021 build specification.
Last word from the dealer “I wanted to touch base and let you know your car is still on track for delivery in April” and “your car is due to our holding site 13/04/2021, if it stays on track we will be looking to hand the car over to you on the week starting 19/04/2021”