Couldn’t work like that. EU programmes aren’t enforced in Britain by EU bureaucrats (they haven’t the power), they’re enforced by British civil servants in British government departments. The moment a British government tells those civil servants to stop enforcing them, they’ll stop.
Yes and no. That is, while the EU bureaucrats didn’t enforce, the Brits created enabling acts to carry out the EU directives. So much of their law has been modified, and their bureaucrats will still enforce these things until they are repealed. Decades of them.
In any event, it is going to be very interesting to watch.