Pronunciation of vowel sounds varies widely between regions, in the US also. For example, there is a passage in a famous novel where people from the North think the people from the South want their 'rats'. But actually, they are just pronouncing 'rights' in a different accent. My name, DAN for example. Normally it's one syllable (and one vowel sound). But where I live in the upper Midwest, some people pronounce like 'Dee-yun'. And in the South where I was born, people pronounce it more like 'Day-un'.

There are many distinct regional dialects in the UK. But the most standard way to pronounce 'find' would be using the /aɪ/ diphthong (as per the International Phonetic Alphabet). As such, it roughly rhymes with eye, my, buy, try, aisle, die, tie, pie, hi, etc.