No costs all free . You can register with defra on the internet and just ring your local egg marketing board up, they will send you all the criterea you need to meet as regards hen housing , stamping weighing , organic, Rspca approved , it will all be in there.They will inform your local council when you are approved to what you have applied for and jobs finished!. The only expense is the equipment,egg boxes, candlers,scales, stamps ,ink etc. But you can get all that for good prices, cheapest I find is Ascot Smallholding supplies (for up here with postage anyway). You need to buy all that so they can check it out at the inspection. Only your production site number stamp that goes on the eggs needs to be bought afterwards when you are given one with the approval.Ascot personalise those as well. Good luck