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Unfortunately full paper isn't out yet but this affected England and Wales and not Scotland so obviously not Ireland either.
Large-Scale Migration into Southern Britain During the Middle to Late Bronze Age
HARVARD MEDICAL SCHOOL
Present-day populations from England and Wales harbour more ancestry derived from Early European Farmers (EEF) than did people of the Early Bronze Age. To study how this occurred, we generated genome-wide data from 803 individuals, almost all from the Middle to Late Bronze Age and the Iron Age, increasing data in this period from Britain by 12-fold, and from Western and Central Europe by more than two-fold. Between 1000-875 BCE, EEF ancestry increased in southern Britain (England and Wales) but not in northern Britain (Scotland), due to incorporation into the population of a stream of migrants who arrived at this time and in previous centuries and who were genetically most similar to ancient individuals from France. These migrants cumulatively contributed about half the ancestry of Iron Age people of England and Wales, thereby documenting a previously unknown demographic process that is a plausible vector for the spread of early Celtic languages into Britain. These patterns are part of a broader trend of EEF ancestry proportions becoming more similar across Central and Western Europe in the Middle to Late Bronze Age, coincident with intensification of cultural exchange and highlighting this period as a peak of interaction and mobility. We find no evidence of a comparable rate of migration into Britain in the Iron Age. The distinct genetic trajectories of Britain and continental Europe in the Iron Age are also exemplified by the fact that the allele conferring lactase persistence rose to ~50% frequency in Britain by this time whereas it was only ~7% in Central Europe and underwent a comparable rise in frequency only a millennium later, a pattern that could only occur if there were qualitative differences in how dairy products were used in Britain and in Central Europe.
https://www.ebi.ac.uk/ena/browser/view/PRJEB47891
There are 803 new samples which should be very interesting to look at. These people were most similar to ancient individual from France.
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