Didn't you receive a delivery Text: estimated 12/8 and 25/8, then a further estimate of Delivery 13 - 20 August?
Here is the process as explained to me today from a senior manager for Tesla UK and Ireland (email extracts)...
"Having had a quick glance at your order I can see you haven’t yet been assigned a VIN number....
...Once these vessels depart one by one, they will then be ‘matched’ to owners across the UK who will then receive an alert via SMS or email.
... we do not have a ‘build plan’ for how these have been created ... I am not able to advise you at which point your car will set sail or which vessel it will be on...
...With regards to your availability, we are able to adjust the appointment by 7 days so this does normally work out okay... Anything outside of that we would assess on a case by case basis....
...Of course if there is anything to advise in the meantime we are now running a batch SMS update system which is proving very effective and enables us to reach out to many customers at once."
This is about as much of an "official" explanation of the process I have received and comes from someone quite senior rather than some of the other staff who seem to make things up and alter their explanations from one call/email to the next. Looks like you are in good shape, just sounds like you have been shouting into the abyss like most of the rest of us.