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Found this about selling eggs should help you
http://www.poultry.allotment.org.uk/Chicken_a/Chicken_Egg_Excess/selling-eggs.php
Quality of the Eggs
The eggs you offer should be clean, but not washed. Most buyers of farm eggs will not be too bothered by a spot of poo on the egg shell but technically you should reserve those for your own use.
The egg shells should not be damaged or cracked. A cracked egg has its protection against microbes damaged and should be reserved for your own use and used as quickly as possible, preferably within a day or two of laying.
Ungraded (Not Sized) Eggs.
The eggs cannot be split into sizes or quality grades, although you might choose to keep the largest and smallest for yourself and just offer the rest. Do remember that people buying eggs from the farm gate, may well like different sizes in one box. It can be very useful when cooking to be able to use a small egg or a large one, depending on the recipe.
Freshness & Best Before Dates of Eggs
You need to display a "Best Before Date" to comply with the law. Usually eggs are expected to last up to four weeks from the date of laying and you should (hopefully) be selling them within a day or two of lay. Assuming your eggs are fresh a Best Before of three weeks from the date of purchase will keep you legal.
All eggs sold on markets whether graded or ungraded have to be stamped with their appropriate producer code. This applies to all producers regardless of the number of hens they have. They need to apply to DEFRA Egg Marketing Inspectorate to obtain their flock identification number.
Additional rules for Selling Eggs are:
You must have a producer number. These available from the Egg Marketing Inspectorate for free. This number also indicates your production type -
* organic (0),
* free range (1),
* barn (2)
* cage (3)
Eggs must be individually marked with your producer code number. You can buy cheap hand stamps and you can even write the number on if your egg sales are low and its not worth the cost of the stamp. The ink you use must be food safe.
The eggs must be sold in new boxes. You cannot re-use old boxes, no matter how environmentally unsound this is. If you have your eggs on a large tray, the customer can bring their own old egg box along to pack them in but you must not keep a stock of old boxes and offer them to customers.
You are not allowed to sell to catering establishments. Even if your eggs are wonderful, it's against the law.
This article is aimed at the backyard chicken keeper with a small surplus from a few hens. In the season, 10 hens will be giving a family of 4 around four and a half dozen eggs surplus a week, assuming the family eat an average amount of eggs.
There's more information on the DEFRA web site