Thanks. I feel very guilty now - normally once another puzzler has identified a car I feel it's the gentlemanly thing to do to allow him/her a bit of time for further investigation. I'm consoling myself that it's OK because this is the Pros. That's now my excuse.
Presumably the owner/designer was influenced by the "Dubonnet" tulipwood Hispano-Suiza. The track is too narrow for my taste.