Parliament could remove the Supreme Court just as it created it. The “supreme” in Supreme Court is inaccurate. In theory at least, Parliament is supreme. Although getting rid of the Supreme Court might be politically awkward.
(That's if we accept that Parliament is no longer a court after the Supreme Court assumed its judicial responsibilities. Also, I'm likely wrong because everything one thinks one knows about the UK constitution is always wrong, but feel free to tell me how so.)
Ha, this cracked me up, and got me thinking whether it's possible that the UK developed legal bitrot because it hasn't had a good revolution in a while. so it's in a sense.