The Marlinspike Taxi, a Peugeot 403, from The Castafiore Emerald.
We first glimpse this little beauty with arrival of the Diva at Marlinspike Hall, after its been unloaded. If you squint you can just make it out from the gates (page 9 D3) as Gino and his cohort from Tempo di Roma case the joint out!
However as Bianca and company leave Marlinspike Hall you get excellent views all round it. Not only luggage on the top, handy little roof rack, but plenty of storage in the boot. And plenty of room inside for Herself, Irma, Wagner and the poor taxi driver if She starts to sing on route!