Had a quick look over the car this evening. No oil has escaped outside the engine, so it looks like the turbo.
Will speak to the garage on Tuesday to see what they say. The only plus side of this is that we could see inside the workshop and there was another 9-5 estate on a lift.
We can't find any hire car places open. None are likely to answer the phone before Tuesday, unless they are an airport. The nearest is a 2 hour taxi ride away. So we are proceeding by train. 5 hours to our hotel. Only one day €50 for both of us for a four hour journey, plus free travel in Germany on their Bank Holiday Monday the next day...
A souvenir...