A long-awaited article on the results of the People of the British Isles project was just published in the journal Nature 519, 309–314 (19 March 2015)doi:10.1038/nature14230
Received 23 November 2013 it took more than a year to be accepted. I've not had a chance to review it and will likely not get the opportunity until late next week. Surprisingly it's not open access although a good summary and extensive supplemental material are freely available.
There's also extensive media coverage including in The Guardian at http://www.theguardian.com/science/2015/mar/18/genetic-study-30-percent-white-british-dna-german-ancestry?CMP=twt_gu