Thanks RedSnapper. I'd spotted the converters, but I think I'll probably leave it as it is.
The meter is currently reading 1 stop high, so I'm compensating by setting the ISO dial 1 stop below the film speed. The ISO scale on the Rollei goes from 25-1600. I can't see me wanting to rate any film at 25 ISO in this camera, but 3200 is much more likely (for me).
It could be quite convenient!