www.gov.uk/government/news/hmrc-urges-businesses-to-move-to-new-customs-it-platform-now-to-continue-trading#:~:text=The%20CHIEF%20system%20is%20closing,the%20CHIEF%20service%20will%20close.
I mentioned this in the Tesco thread, but thought I'd give it it's own post as it's easily missed.
Customs have changed their IT operating system as of 30/09/2022, and there's likely to be lots of import delays until businesses get themselves registered. This will cause a lot of shortages, but it's temporary and then everything will probably come flooding in all at once.