Posted By Ron Hunter Not yet, I suggest. You'd want a final design before you go to to the expense of any formal testing (which might involve significant £££ if you're talking EMC, low voltage directive etc)towards declaration of conformity. Having to resubmit due to significant modification could be costly. From a marketing and business perspective though, you'd want to be considering the costs and lead -times associated with conformance testing and obtaining necessary certification towards CE declaration. Some good stuff on this at the BERR website.