One of the most important sources is the DEFRA website. I have
described the page for a day in September 2003 here,
and I have included a hardcopy record of that page here.
The main source that I have used is the MAFF / DEFRA departmental
report for 2002. I have scanned pages and photographed the book
as follows (please click on the thumbnail if you want to see the
page or photo full size.)