Ah sorry I think I explained my situation poorly.
I placed the order myself, have my RN number and final invoice.
But I am using Halifax’s PCP product (the financial numbers work slightly better than Teslas PCP) - Halifax finance’s portion of the payment is sent directly by them. I basically provide them with Tesla’s bank account details.
I spoke with Tesla on it last week and as Halifax aren't an approved Tesla finance partner they advised that this be treated as a cash transaction ditectly invoiced to me. I suppose all Tesla really care about is the balance being paid off.
My worry is that when reading previous experiences of Halifax PCP ive seen it mentioned that they send the payment to the dealer using the registration number as reference, no more than a few days before delivery - from what I read they wont budge on this. Probably worth me calling and asking though. Would hate for this all to fall through over a reference number and not being able to find a payment in time