After 2 years being on the waiting list, I finally got my copy of the following set of books. A set of 7 volumes, each 500-600 pages.
The Illustrated History of Apples in the United States and Canada by Daniel J. Bussey, edited by Kent Whealy, and published by JAK KAW Press, LLC
They must weigh something like 20kgs and are going to take me years to read through.
With over 16000 varieties listed, it has taken Daniel J. Bussey, and Kent Whealy over 30 years to compile. Obviously many varieties are of UK origin, but it covers worldwide varieties.