The primary language is English.
English is the de facto official language of the UK. Irish Gaeilge, Scottish Gaelic, Scots and Welsh are widely spoken in some areas.
People of France speak French
People from France speak French
German is there mother tongue and 63.7% people speaks this language there!
that's like asking why do Humans breathe! COMMON SENSE!
They Speak English
it is spanish
Spanish.
Arabic
Lenguajeidioma
english
French.
English