The new GCSEs are linear and therefore do not use UMS. For an explanation of how the new linear qualifications work, check out our blog.
The following document provides overall qualification UMS boundaries for all unitised qualifications for all series in 2017/18. This includes legacy GCSE, AS and A Level and Cambridge Nationals. Qualification UMS grade boundaries are not available for the new reformed qualifications as they are linear qualifications and do not have UMS.