JTP, there is a good article here
http://rspb.royalsoci...nt/275/1650/2423.full which discusses strong links with the Belgae (germanic speaking) before the Roman Conquest.
I did not say there was a conspiracy amongst academics against this theory, just that for most it would be much more trouble than its worth. Otherwise the academics are reacting to the modern genetic data as they did to carbon 14 dating - first denial, then cold shouldering then, probably, acceptance. Note that pre C14 history was often wildly inaccurate.
Mosaic, no, I am not mixing up Doggerland with Dogger Bank, the huge Island that the dogger bank marks only disappeared in around 3000BC.
Mosaic: "As you have noticed, you find yourself quite quickly in the realms of the wild-eyed fanatics rather than being part of a reasoned debate. " No, I don't think you are a fanatic, perhaps a little closed to new hypotheses :). Compare your 'wipeout' statement "These immigrants entered a landscape that had become largely abandoned" with the statement by the academics who wrote the paper for the Royal Society referenced above: "The argument concerning the relative sizes of the two groups—Britons and the Germanic people who arrived during the Early Anglo-Saxon period—is conceded, and, as discussed below, estimates obtained in the present study agree with those of Thomas et al. (2006), namely, a ‘native population in the region of two million’ and ‘migrating populations in the Early Middle Ages are between tens and low hundreds of thousands’. "