After the Romans departed, systematic construction of paved highways in the United Kingdom did not resume until the early 18th century. The Roman road network remained the only nationally managed highway system within Britain until the establishment of the Ministry of Transport in the early 20th century.
Europeans were not a sophisticated bunch of people when the Romans invaded. Pretty much every idea “from Europe” through 1900 was borrowed (lol) from somewhere else. Including industrial era basics like iron.