These Regulations, which apply in relation to England only, revoke and replace SI 2004/2885 which implemented Commission Decision 2004/665/EC (O.J. No. L303, 30.09.2004, p.30) concerning a baseline study on the prevalence of Salmonella in laying flocks of Gallus gallus. They correct errors in the interpretation and offences provisions and make other minor drafting changes.