So there had been a thread called,Cool potential migrations'. I can't find it and think that it might be inactive right now. So I find the general discussion quite interesting and think that there should be forum for ideas in a general context. So for example what if Britain was settled by Franks, Goths and Alans or Slavs in Western Europe. So you can insert your ideas and discuss. You can also come up with ideas of alternte ethnogenesis and linguistic developement in context of this thread.