Update.
Picked my car up from Giallo. Started. Went into gear. Drove off. All good.
Got half a mile up the road, went into 4th gear, and then went straight into neutral. Turned the engine off. Turned it on again, drove back to Giallo, went into 4th gear, same thing.
So I've left her back there for them to look at when the diagnostics come back from Italy.
And just to add insult to injury, when I got back to Giallo I found a note in the car.
The RAC bloke who had unloaded the car had not put the handbrake on properly and the car had rolled into something, scratching the rear bumper and valance.
Joy. So that will have to be done as well. Fair play to the RAC bloke for owning up. But I think he's paying for it out of his own pocket!
I did warn him of the potential cost.
Looks like I'm coming to the Christmas bash in the Merc