I've been pointed in the direction of a very early Beta Berlina for sale in the Netherlands. Andy C informs me that it has a factory sunroof and is therefore very rare. From the photos it looks pretty solid, having been in the same family from new. It's been stored at the garage that's selling it for 8 years after the owner failed to collect it.
Here's the link
http://link.marktplaats.nl/188769517Maybe BetaBoyz need a new staff car?
Lee