Right, so are you now getting info directly from SEAT? Ie my wife started to get updates on progress from VW - ie "into build" "with the factory" etc ect? If not see if your dealer can sort that out.
Just be aware that these cars probably get built and are on a train to the docks within 4 days, so next thing is to annoy your dealer into getting the name of the transporter ship and then you can track it from Spain, either to the muster point in Embden Northern Germany, or directly to UK. Sometimes these huge ships leave with mixed VAG marque products and get sorted out for localish distribution and into smaller transporter ships in Embden for transport to your local port that VAG use.
Edit:- marine movements or maritime movements website for ship movement and tracking!