Earlier quoted context omitted.
I seem to recall the latter being expected, that the UK would drop regulations on imports, leading to low-quality American foodstuffs (corn syrup) flooding the market
A Facebook ad caught my eye recently, as it was a British newspaper's "Least healthy breakfast cereal" and the picture was something I didn't recognize at all. I was then surprised to see American cereal is now sold in the UK, and it's packed with the colourings and additives British parents in the 1990s would have refused to have in the house. Pre-Brexit, "No artificial colours or flavours" could be pretty much assu…
They were commonplace in drinks aimed at kids (Tizer for example) for years.
Putting them in breakfast cereals is IMO mindblowingly irresponsible; the food producers know for sure (because the link has been established with little doubt) that tartrazine and sunset yellow worsen child behaviour.