Angela's answer would usually be right for spoken British English as well. However, there is one special context which is different. When people write a date quickly, they might write it as "1/11/18". People would usually pronounce this as "the first of November twenty-eighteen". However, in a situation with limited time (like saying your birthday to the bank), some users of UK English would say "first of the eleventh eighteen". I think it's especially common when this is quicker than saying the month's name ("first" has one syllable, "January" has three), though I'm not certain.
Can any Aussies, Indians, Singaporeans, etc., tell us whether this happens with other forms of British English?
I can also tell you that in Mandarin... well, look at the words for yourself:
Even if you've never studied any Chinese, you might have guessed that the the names of the months are simply "Month One", "Month Two", etc.