Certainly.
First I would be obliged if you were to have a quick read of this one :http://www.shootingfacts.co.uk/pdf/pacec_glossy1.pdf
This also seems to be a good introductory document : http://www.basc.org.uk/en/utilities/document-summary.cfm/docid/367BFC86-CB24-43F9-B3484DB26743E334
Needs further reading but my first reaction is the old quote "they would say this wouldn't they?".
Interesting article this
http://www.telegraph.co.uk/earth/ea...ve-to-rely-on-pheasants-reared-in-France.html