All this is moving toward an elusive goal: to find a "buy button" inside the skull and to test products, packaging and advertising for their ability to activate it.
She made one error, cutting off the call briefly by hitting a wrong button, but this might have been because it was a test in which I was at one point using a phone also listed for my wife as a contact.
McLaren have a big package of new parts to fit to the car overnight to try out on Saturday, when Jenson Button will take over from Hamilton, who drives again on the final day of the test, Sunday.