Thanks Charles very useful information, the Tesco COP has essentially what i have seen in most businesses regardless of working with Tesco or not.
In other posts including my own, i noticed that an approach i thought of validation of the CCP is on the right path however whats interesting to me is that where some people state "get manufacturer to confirm capabilities sensitivities etc" my validation which is similar to Mgourleys test piece validation document http://www.ifsqn.com...try/#entry88160 8th post down, when i did it for our products i found that they were wrong! we can in fact detect a whole 1.0mm smaller 100% time for ferrous and NFE and stainless is the only one that was ok at 3.00mm
Any case i got what i need and shall write up a procedure today if i have time, that or tomorrow morning. however it will not need all the fail-safe that are available on market because we only use a stop belt system due to process constraints.
will post my resulting document here when done.