Thanks for the example but there being other cases and me as an average person who follows the news having no idea about all this make it even weirder for me.
Regardless, the UK is still run by the same pro-EU loyalists it was run by for decades, and they largely continue EU policy. You will notice that a lot of people are very unhappy about that, but it takes time to completely replace the entire political class of a country - especially when that class bought time by pretending they were going to make a break with EU ideas and demands, whilst secretly planning to do the opposite.