As an aside, due to lack of regulations, people in the US end up with a lot of bugs in their food, compared to other western nations. Though, because of Breexit, the UK was considering scrapping a lot of its food regulations, so dunno if they are eating bug ridden US food yet.
Not yet. One of the pieces of withdrawal legislation moved all existing EU regulations, including food safety standards, into UK law automatically. This was entirely necessary for Brexit to be possible: the UK (like many European countries) hadn't bothered to make separate British legislation for things already covered by EU regulation, because it would have been redundant. So that meant there was a heap of EU regulations we did want, alongside the ones we theoretically didn't want. Hence: auto transfer it all into UK law, then the gov can take its time repealing just what it doesn't want. Almost sensible, insofar as Brexit can be sensible at all, which isn't much.
Of course, the Brexiter Tories don't like pragmatism, so they started agitating for all EU-originated legislation to
expire automatically if the UK parliament didn't explicitly pass a vote to keep it. Individually.
This caused a bit of a fuss last week, when the gov was forced to postpone the supposed deadline, because the amount of work and time involved in sifting through it all to find the bits you want-- to an arbitrary deadline solely there to appease firebrands-- was untenable.
But postpone they did, because it's literally the only way to avoid a catastrophic lapse in law. Cue Suella Braverman pointlessly blaming civil servants, and Jacob Rees Mogg blaming the government for "betrayal". Because these are politicians who simply don't grasp their own jobs.
....sorry, that was a huge tangent. TLDR: We've not had a big lapse in food safety standards (yet) because existing EU regulations still apply, having been automatically transferred into UK law and not expiring.