Methodology for core service level reporting

In these document the methodology used to report on core service levels under the reference offer services level terms. This information will evolve over time as changes, that had been the subject of discussion with the industry, are made to products and services. When we update the methodology, we'll attach a copy of the revised methodology to the relevant core service level report provided to service providers. We appreciate that the methodology for reporting core service levels is complex and are happy to talk to you if you have any questions.