So an answer on my M3 LR White order. Likely pushed back to Late May, but there are a few which haven't been allocated yet. (Not sure really how they mucked that up, I ordered a month ago, and the car would have needed to be on a ship by that point if they were going to fulfil march...)
I'd put down brent cross as the delivery location, but that location isn't opened yet, and the system actually put bluewater instead...
Contact info
I called them on the showroom number - when I called from a number on the order I got a "We're busy, don't call us, we'll call you" message. When I called from a different number they allowed me to join the call, and the callback function worked fine.
I get they don't want people calling to chase every 2 minutes, but I don't think it's wildly unreasonable to want to speak to someone when you're expecting an inventory order and it's pushed back...