Due to the fact that EU countries make laws together and have a system of mutual recognition in areas where the EU hasn't made laws...
Anything made in the UK is automatically legal to sell across Europe* without costly adaptations or checks.
So what does that say about anyone who said all countries have access to the Single Market?
THEY LIED TO THIS COUNTRY
#EuropeanElections2019
NOT THE SAME AS THE "EU MARKET".