Yes an individual viking raid may only have a few hundred Vikings but they weren't the ones settling. The only part of... most of what we now think of as Britain (and bits of Ireland amongst other places) where Vikingish enough to speak... Danish and probably Swedish and Norwegian and Finnish and... whichever particular group happened to own or run the that bit of the country at the time. Was Vikingish enough that the only bit that wasn't part of the Danelaw was Cornwall and Devon area. Quite literally a toehold. Obviously there were pre-Viking Brits all over the place too but clearly not in the numbers to be able to cope with "a few hundred Vikings" - were they all fannies or were they just damn sure they would be on the wrong end of the raping and pillaging (again) if they tried that cos there were quite a few of the blighters around?
Fill the rest in yourself and try not to draw over the lines - or gloss over the blindingly obvious facts. At least 2000 years of fairly regular and fairly complete being invaded and ruled by foreign folk adds up. And their children have children and so on - exponentially up until today when we're so intermixed that is the only "true British blood" that exists. Mixed blood. And even then that's only 2000 years out of 10s - if not 100s or indeed 1000s - of thousands of years before the bit you're arbitrarily taking as a start point of some kind. Flimsy doesn't come close - your argument doesn't eixst let alone be a bit hard to see amongst the speculation and blind hope (or fear I suppose). No part of any of it makes sense and virtually nothing you've said so far is even true. If this mythical people are so very obvious to all then where are they? How much foreign makes you a funny foreigner and how much does it take before you become Romanian?
Fill the rest in yourself and try not to draw over the lines - or gloss over the blindingly obvious facts. At least 2000 years of fairly regular and fairly complete being invaded and ruled by foreign folk adds up. And their children have children and so on - exponentially up until today when we're so intermixed that is the only "true British blood" that exists. Mixed blood. And even then that's only 2000 years out of 10s - if not 100s or indeed 1000s - of thousands of years before the bit you're arbitrarily taking as a start point of some kind. Flimsy doesn't come close - your argument doesn't eixst let alone be a bit hard to see amongst the speculation and blind hope (or fear I suppose). No part of any of it makes sense and virtually nothing you've said so far is even true. If this mythical people are so very obvious to all then where are they? How much foreign makes you a funny foreigner and how much does it take before you become Romanian?

(sorry, I had to)