Chatting to guys at a Suzuki dealer about Euro 5. They said that all new models introduced from Jan of this year have so be Euro 5 compliant, and older models that are new and are not euro 5, can not be sold after Jan 2021. So expect some heavy discounting at the end of the year. Most of Ducati's current range are euro 4. Makes you wonder about investing in a multistrada at £18000 that's not euro 5
I think it will depend on the build date and CofC whether you can register a Euro 4 after 1st Jan - it's always been retrospective and I haven't heard that has changed? It nearly did in 2003 when loads of new bikes were pre registered but then they decided not to
I think you can register any Euro 4 that is already a current model. Only if its a brand new model will it have to be Euro 5 in 2020. But after Jan 2021 you can not register a new bike that is euro 4