“the post-glacial rebound of northern Great Britain (up to 10 cm per century) is causing a corresponding downward movement of the southern half of the island (up to 5 cm per century)”
IIRC, the Low Countries also are sinking because of post-glacial rebound.
https://en.wikipedia.org/wiki/Post-glacial_rebound#Vertical_...:
“the post-glacial rebound of northern Great Britain (up to 10 cm per century) is causing a corresponding downward movement of the southern half of the island (up to 5 cm per century)”
IIRC, the Low Countries also are sinking because of post-glacial rebound.