Re: All of which just proves....
"I have sent them details on UK companies which are in multiple violations of both the old law and GDPR itself and which continue to blatantly market and sell your (out of date) personal data without your personal permission. With company numbers, addresses, the lot. They are happily scratching their nether regions instead of enforcing it."
Be sure to register your account with those companies using a tasteful fake nude picture of a randomly selected Member of Parliament. "Calendar Girls" level, with the face Photoshopped on. This either might get something done, possibly to you, or, if not, is at least slightly amusing, especially if it's Facebook and they are facially recognised.