Phosphorus and nitrogen limitation and impairment of headwater streams relative to rivers in Great Britain: A national perspective on eutrophication.

•National-scale assessment of headwater stream nutrient status, relative to rivers•Greater potential for P limitation in rivers and N limitation in headwater streams•Greater potential for P and N co-limitation in headwater streams than rivers•Nutrient impairment of water quality was greatest in Lowland-High-Alkalinity rivers.•Nutrient Limitation Assessment could help inform the prioritisation of remediation.