Why in the era of Charlemagne, missionaries and educators sailed from England to France and Germany, and not vice versa?

England was less affected by the migration of peoples in the 5th-6th centuries. There Roman-Christian culture was better preserved, and Karl willingly invited enlighteners from there.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.