The Vikings didn't reach into the Briton's areas much except for Dun Claith
The Saxons were subjugated by the Danes, but not exterminated or pushed out. In fact since the Danes spoke a variation of the same Germanic that the Saxons did, the two groups were more or less interchangeable
Do you remember the subjugation of the Saxons by the Normans or the fact that they are stilled a people ruled by a foreign monarch, in many respects? -- I know it better than you -- did you even read my point about "except Moslems"?
If the Brits have lost their culture and now have a gay-loving liberal culture, then it being replaced is no loss.
and, i've lived in the UK, so my experience is that they have lost their culture. If you were talking about Ole Blighty culture being taken over by foreigners, then yes, it would be tragic, but "gay-good, NHS-good" culture being wiped away is not a tragedy.
If this was being replaced by the old 50s English culture, good, that's preferable. But that is not happening, not even in the UKIP or EDF.