The UK English
English is the official language of UK. But is very different from the typical english. It is called British English. It is totally english but you can differentiate whether it is British English or the Usual English. Because of the accent of the British English you can simply know that it is British English. British English and the Usual English has a lot of differences. For example, their vocabulary, spelling, collective nouns and past tense verbs. For example you can't call an eggplant just an eggplant, in UK English it is called an aubergine and pants is called trousers in the UK English. And some of the spelling of words are different, usually the UK English has added z or e in the words. The UK English is not hard to learn at all. You just have to have the accent and to know their vocabularies.
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