WI ithmus of dover?

[Straha]

The Weald of Kent is only the west half of the original Weald. The
reat stretched across the Straits of Dover and its east end survives
OTL in France behind Boulogne as the Boulonnais. It was cut through
in the Ice Age when ice blocked the north exit of the North Sea,
which overflowed southwest between England and France.

What then if there was an Isthmus of Dover now?

[Mike McGee]

Britain has been invaded many times over the past 2 millenia, but the fact that the country remained independent of european empires has been due simply to it's island nature. any land border with europe would have surely meant defeat to the much more powerful french forces during the napoleonic wars or even to the nazis in 1941

[Leej]

I think the differences would have been a lot earlier then that, assuming there is a butterfly net I would assume we would be just part of some bloated France after the fall of the Roman Empre.