I went to the CAA today and converted my JAR CPL into an EASA CPL, using my restricted JAR class 1 medical. So now I have an EASA CPL, at least until my JAR medical runs out.
When it does I will not be able to get an EASA class 1, because the EASA rules prohibit the addition of the CVD restrictions to a class 1. This means that my CPL will revert to PPL privileges. I can continue to instruct for PPL and LAPL, but I will not be able to instruct for CPL. Not a big deal to me personally, because I don't have ambitions in that direction - however it could be a blow to someone like me hoping to move up the instructor ladder to the more lucrative CPL instruction rung.