The diets of 85 individuals from 21 sites were modelled using FRUITS based on their bulk bone collagen C and N isotope ratio signatures. The sites, which occur in a range of environments, group into three distinct periods corresponding to the British ‘Late Upper Palaeolithic’, ‘Early Mesolithic’ and ‘Late Mesolithic’, respectively. The FRUITS models for three LUP sites dated to the Bølling–Allerød Interstadial suggest an empha...