Are you sure they were required to? Weren't the housing orders lifted just before such would become necessary?Some producers really struggled to manage the cost of changes to labelling that were required a few years back
In 2023, when the order did go beyond 16 weeks over the previous winter and into the spring, the only labelling change I saw in the chain stores was a sheet of A4 (apparently printed in the supermarket and stuck on the front of the shelves with a bit of sellotape) saying that these were Barn Eggs, with or without some explanation about the housing rules and AI. Do you know any producer/packer who actually did print new labels for their cartons? Everyone knew it was temporary and would be lifted sooner or later, so who'd go to that expense? Most people seem quite happy to apply hacks, and I heard of no case of someone being prosecuted for the wrong labels.
Finally, this is shutting the stable door after the horse has bolted. There were no general housing orders this winter. The approach has changed; birds will develop immunity. Besides, small scale organic producers are finding better ways to market now. See e.g. https://www.redwoodsfarm.co.uk/eggs/ or
https://oldhallfarmshop.co.uk/products/6-free-range-eggs
and Riverford, Ruxtons and others are acting as hubs too.