Celts descended from Spanish fishermen, study confirms

[Robert Vermaat]

He says there were already many people speaking Germanic languages on the island before the Roman conquest. Interesting.

Tacitus reported that between Britain and Gaul "the language differs but little."
The common language referred to by Tacitus was probably not Celtic, but was similar to that spoken by the Belgae, who may have been a Germanic people, as implied by Caesar. In other words, a Germanic-type language could already have been indigenous to England at the time of the Roman invasion.

Caesar implied the Belgae were Germanic? Can you find the quotes for that?

As to the question if Germanic was spoken in Britain before the Roman invasion, i have held many discussions with people about that. Some of these come from the ultra-right wing and claim that English was spoken in Britain since the Ice Age! The claim that Celts were the aliens and Germans the indigenous people.
Others are from Belgian language-debate, who want to prove some language-divide in Britain, too.

So far, I have yet to encounter any evidence for Germanic in pre-Roman Britain.