I've had a closer look for the source of the oil leak that occurred last night. It looks like it either came from the exhaust manifold fixing, or the cylinder head gasket. Look at the pics and see what you think.
The oil came out on our journey up the M6 to Blackpool. I got some oil spots on my sunglasses. I swapped these for my regular glasses before getting to Blackpool, and those remained clean.
I will report this strange fault at 1000 mile service.