I would just read up on Defra to be sure.
In Ireland all eggs sold through markets and shops have to be processes through an approved egg washing system, then date stamped with red ink and graded ( I know - Crazy) This stops you selling to local shops or at local markets.
As far as I know you can sell to anyone who comes to the farm gate for eggs.
EXCEPT
One other rule is that the purchaser has to be the eater. i.e. If a person comes to buy your eggs at the farm gate, to use in their bed and breakfast, you are not allowed to sell them.
This is to protect people from salmonella, and to have food traceability, and I can see the reasoning behind it - I have bought eggs from farmers markets and some have been rotten, obviously found in the field and had no idea how old they were (yuck! ruined my Yorkshire Pudding mix and stank the kitchen out!)

Anyhow I only sell mine to neighbours that call to the farm, I hate having to buy eggs that have been washed and date stamped with red ink, thats not natural, and the eggs shell is porous therefore anything like flouride or chlorine in the water is now in your lovely fresh egg - as well as red ink - probaby made from cochin - even yuckier

All I can say is be glad you can produce your own eggs and eat them - and encourage others to do so too
