What language do people speak in Britain?

In Britain, the main language is English (British English). It is not the same as American or Australian English. 'Hi mate' is not the correct and appreciated way to approach someone in the street. Neither is 'G'day', 'Howdy' or 'Hey Mister'. The formal British way to greet someone is 'Good morning, good afternoon or good evening' and, if you want to ask something, 'Excuse me, please'. Most people in Britain usually say' hello' or 'hi' when they greet someone.