Changes to the per-order fee structure was announced in the January Seller News (https://community.ebay.co.uk/t5/Announcements/Your-January-Seller-News-is-here/ba-p/7984899), though in typical eBay fashion it was hidden under the heading 'Trust and protection'.  If you click on 'Read more' it takes you to https://www.ebay.co.uk/sellercentre/news/2026-january; Page Down, click on 'Changes to per-order fees' and you get https://www.ebay.co.uk/sellercentre/news/2026-january/rate-card-change where all the changes are detailed.

To play Devil's advocate, eBay would probably say that an announcement was made but it's up to sellers to read the monthly news bulletins. Personally I think changes to fee structures should be made far more transparent - an email detailing the actual changes is one obvious solution, rather than sneaking out changes which not everyone will read.

Then again, this is eBay. When have they been open and honest about anything?