Ingested microplastics identified from macrobenthos collected during the RRS Discovery D340b Research Cruise to the Mingulay Reef Complex (Outer Hebrides, western Scotland, northeast Atlantic), supplement to: La Beur, Laura; Henry, Lea-Anne; Kazanidis, Georgios; Hennige, Sebastian; McDonald, Alison; Shaver, Michael; Roberts, Murray J (2019): Baseline assessment of marine litter and microplastic ingestion by cold-water coral reef benthos at the East Mingulay Marine Protected Area (Sea of the Hebrides, western Scotland). Frontiers in Marine Science