According to an American English grammar book, the following rule is given:
Every and each are always followed immediately by singular nouns. However,
1) Every man, woman, and child needs love.
2) Each book and magazine is listed in the card catalog.
In this case, even when there are two (or more) nouns connected by and, the verb is singular.
Dear TEACHER! Is it equally true for both standard British English and American English? Is there (stylistical) difference between formal and informal?