First off, hi and sorry to hear about your issues.
Some practical notes:
It's not the dealer's fault you live so far away. Any costs to get the car back to them is your burden, customer service notwithstanding.
How many miles have you done, and how much oil has been used? Up to 1L/1000mi is acceptable according to the tech documents.
You either need proof the car is faulty (so pay Abbey to strip down, not something I'd do) or you need to give the car back to them and reject it. Proof of oil usage would be acceptable to use in court, so receipts & videoing works.
You do need to give the car back to them one way or another, so take the easy approach first.