The teachers work with youngsters ranging from pre-school age to 19.

BBC: Teacher of the deaf

"My perception in the school-age range and pre-school-age range was that how the at-home parent is doing is most predictive of how the child is coping, " Davis said.

CNN: Experts: Parents' deployment puts kids at high risk for problems

Christine Jenkins is an ex-patriot American who believes being bilingual is essential for living in Europe, and that pre-school is the crucial age to start.

BBC: Curb on schools' languages innovation

Comparing the results of children who had been in pre-school classes and those who had not, the former pre-school pupils were seen to be more popular in all primary age ranges - with the most pronounced gap among 10 year olds.

BBC: Nursery children more popular

Owing to the fact that participation in pre-school education is voluntary, ministers say they are now aiming to make sure 85% of youngsters in this age group take part in nursery education.

BBC: nursery