Somebody mentioned placing your whole eggs into a nalgene bottle that is topped up with water and the eggs do not break. That may be worth a go, the egg powder from Tesco isn't great to be honest and is only good for scrambled egg (tastes a bit weird though) and cooking such as bannocks and pancakes. Tesco may not be stocking them as I believe the great chicken fiasco that HFW kicked off last year had something to do with eggs IIRC. I believe Hellmans' are stopping the use of battery eggs in their mayonnaise and Tesco was stopping the sale of anything with battery eggs in it, which is exactly what the powdered egg would be made from. I still have a tub sat in the cupboard, it has a use by date (which it has passed) but it still tastes the same as it did when I bought it (ie. weird!) and doesn't seem to have been affected by passing the use by date. It is for use in extreme emergencies, so I reckon it'll stay there a little longer!