As a Brit who loves custard and trifle, I second the recommendation for Bird's Custard. It's a staple in most British pantries. You might also want to try Ambrosia brand Devon custard, which comes readymade in either a can or a Tetrapak, and is available online. The ingredients are all-natural, and it's super creamy and delicious (though not quite as good as homemade from scratch). Hope this helps.
As recipe author is from UK, consider Bird's Custard, the dominant traditional British brand. In recent years Bird was variously taken over by several American consumer goods companies, so it may be available in USA grocery stores. Or from online merchants. If you can't find it, there are other brands, including those for flan or creme anglaise (which are very similar). In a pinch (without packaged instant custard), make from scratch or use one of the substitutes in this article. https://thekitchencommunity.org/substitutes-for-custard-powder/
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In recent years Bird was variously taken over by several American consumer goods companies, so it may be available in USA grocery stores. Or from online merchants.
If you can't find it, there are other brands, including those for flan or creme anglaise (which are very similar).
In a pinch (without packaged instant custard), make from scratch or use one of the substitutes in this article.
https://thekitchencommunity.org/substitutes-for-custard-powder/