When did English become the official language?
By the late 18th century, the British Empire had spread English through its colonies and geopolitical dominance. Commerce, science and technology, diplomacy, art, and formal education all contributed to English becoming the first truly global language.
Considering this, What was the official language in England before English?
Common Brittonic (also called Common Brythonic, British, Old Brythonic, or Old Brittonic) was an ancient language spoken in Britain. It was the language of the Celtic people known as the Britons.