I have already dicussed the probability that the Germanic peoples had a presence in England thousands of years before the accepted date of around 449 CE. The Ancient Presence of the Germanic Peoples in Britain
In addition to the presence of the Germanic peoples in England their presence is also to be found in other parts of the British Isles. http://celto-germanic.blogspot.co.uk/2012/06/ancient-presence-of-germanic-peoples-in.html.
The Germanic peoples brought their Cult of Woden with them and Woden appears to be the same daity associated with Gwydion. http://celto-germanic.blogspot.co.uk/2015/06/woden-as-gwydion-belgic-god-of-ash.html
There is potentially further evidence for the presence of the Germanic peoples in Scotland. Certain interesting passages from Tacitus' Agricola seem to indicate this:
"Who the first inhabitants of Britain were, whether natives or immigrants, is open to question: one must remember we are dealing with barbarians. But their physical characteristics vary, and the variation is suggestive. The reddish hair and large limbs of the Caledonians proclaim a German origin; the swarthy faces of the Silures, the tendency of their hair to curl, and the fact that Spain lies opposite, all lead one to believe that Spaniards crossed in ancient times and occupied that part of the country. The peoples nearest to the Gauls likewise resemble them." (Agricola 11, translated by H. Mattingley, revised by S.A. Handford, my emphasis)
This physical description of the Caledonians is matched by an obervation by Eumenius who wrote that both the Picts and the Caledonians had red hair. However we must be cautious and bear in mind that Tacitus does not reveal the identity of the language spoken by the Caledonians
Another interesting passage from Agricola concerns the perceived shape of England and the island of Britain:
"The general shape of Britain has been compared by Livy and by Fabius Rusticus-the finest of ancient and modern writers respectively-to an elongated diamond or a double-headed axe. Such indeed is its shape south of Caledonia, and so the same shape has been attributed to the whole." (Agricola 10)
This perception by the ancients of England or Britain as being diamond shaped is significant for the diamond is the shape of the Anglo-Saxon Ing rune and the Common Germanic Ingwaz rune. This rune is the rune of the God of the English, Ing. Indeed we have a mystery here for the association between the God of the English and the perceived shape of the homeland of the English are both encapsulated in this rune's shape. This is a powerful argument for the case that the English have always resided in Albion and that their supposed arrival in 449 CE was nothing other than a RETURN. One could thus argue that England or Britain is their Urheimat and not simply a territory colonised by Germanic tribes in the mid 5th century CE. To find therefore a people such as the Caledonians residing in the north of the island and being likened by Tacitus as Germans further strengthens the argument that these islands have always been in the possession of the Germanic peoples.