Here’s some of the first stuff up on a search: http://www.keepers-nursery.co.uk/search ... ?id=COXORP
It’s ‘British,’ so a lot of obscure varieties are listed...
Here’s something with regard to the Cox Orange: “They are in the mid season category and can cross pollinate with most other apple trees, as long as they do not flower very early or very late.â€
…your question’s looking ‘better’ all the time 
Personally, the best ‘mid-season’ pollinator I know is a “Yellow (or ‘Golden’) Delicious.†My tree appears to be self-fertile, with a mid-period bloom that should work with the COP – and, it’s one of my favorite apples.
Any other suggestions..?
I've had good results with a limb of Liberty grafted on my Cox's Orange Pippin tree.
http://www.bunchgrapes.com
Thank you very much for your replies to both of my questions. In my orchard the cox orange pippin is the last to bloom and I think this is why it does'nt bear much fruit. I have two liberty apple trees next to two cox orange pippins. The orchard has twenty different varieties and also some bee hives. I liked the idea of grafting another late blooming variety onto the cox. Maybe I'll also try spraying a bee attractant on these trees.
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