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Plastic DPC degrades in sunlight because it is not designed to be exposed to UV rays. You'd be better off using 5u felt for the bit going into the gutter and then using breathable membrane for the rest of the roof. Breathable membranes are better than bitumen felt for the rest of the roof...

This is advise from the NHBC Question Can plastic dpc material be used at eaves level in place of a type 5U felt? Answer Dpc materials should not be used for the exposed sections of roof underlay at the eaves. Plastic dpc materials are generally not designed for use in permanently exposed...