Jerry, I realize England is not the only signatory to CIP--but you referred specifically to British reproof.
The email from the Birmingham Proof House resulted from an article I wrote for Shooting Sportsman about 10 years ago. They sent it to the Proof House for comments. Here is the response:
"The reference in the article to the CIP service pressure of 650 bar and proof pressure of 850 bar is a reference to crushers values; the equivalent transducer values that should be used for comparison with SAAMI transducer values are 740 bar service and 960 bar proof, i.e. 10,730 psi and 13,920 psi. CIP crusher service pressure for high performance (magnum) is 900 bar and proof 1200 bar. The transducer values are 1050 bar service, 1370 bar proof."
So . . . we (and the British) are still two peoples divided by a common language.