Consensus among geologists is that substantial portions of that island did in fact drift away from what we know as France.
Plate tectonics has everything moving, so although I am an amateur, it seems the fact that the British Isles are moving away from Europe doesn't prove much.
You mean the rosbifs actually live on our land ? JEANNE, AU SECOURS !
Geographically, yes. Politically, much less so - unfortunately.