I'm curious as to how the Britons interacted with the Anglo-Saxons during the Anglo-Saxon period.
Thanks
A book which will answer most, if not all, of your questions is T.M. Charles-Edwards' magisterial new book (now released in paperback, although it's still something of a doorstop at 795 pages) Wales and the Britons 350-1064, (Oxford, 2013). As you can see from the contents page, this is a detailed study of what you want to know. Well worth the odd £20-£25 to have at hand.