The number of pollen grains delivered to stigmas in a single visit by flower visitors (from insect orders Coleoptera, Hymenoptera and Diptera) to oilseed rape (Brassica napus L.) in southern England. Behavioural and morphological data were also recorded for a subset of visits to understand common traits which led to improved pollen delivery. These data were collected as part of Wessex BESS project, funded by the NERC Biodiversity and Ecosystem Service Sustainability research program. This dataset can be used in conjunction with other Wessex BESS datasets, in particular the landscape scale survey of pollinators. Full details about this dataset can be found at https://doi.org/10.5285/ee145769-2853-4a89-8aa6-c4a5149d07c0
