Since when have eggs in the UK said "at home, refrigerate" (and why)?
Storing eggs in the fridge avoids temperature fluctuations, and ensures they are kept below 20°C.

I am happy to report that there exists the British Egg Information Service, who state:


  For optimum freshness and food safety, eggs should be kept at a constant temperature below 20°C. To avoid the typical temperature fluctuations in a domestic kitchen, we recommend that eggs are stored in their box in the fridge. 


As for supermarkets storing eggs at room temperature:


  Most modern supermarkets are kept below 20°C so it is not necessary for retailers to store them in a fridge. This also prevents significant temperature fluctuations (for example eggs being moved from a fridge to a hot car after purchase).


Indeed, the British Lion code of practice - a scheme for ensuring the safety of eggs with the Lion mark in the UK - recommends that retailers store eggs at a consistent temperature below 20°C. It also looks like eggs won't usually be in the shop very long, as they say the display cabinets should ideally be cleared completely twice a week.

Personally, I've always thought that keeping eggs in the cupboard is fine but that they last longer if you put them in the fridge. Remember that passing the best before date only means that flavour and texture might not be as good; food can be past its absolute best but still be acceptable.



It's worth pointing out that eggs really must be kept in the fridge in some countries, for example the US. See the answer by Cos Callis.