Recently I started to notice how diverse English pronunciation in my YouTube subscribes become and I started wondering is there an easy way to detect which dialect is which since I am no linguist. Well, Jimmy Carr references kinda good, but they are not written/explained and used in a different way and do not cover up all of them. Is there some kind of resource that helps to detect the accent/dialect in a steady pace or is it still easier to ask about concrete people?
While it's not exactly what you're looking for, Sound Comparisons — Exploring Diversity in Phonetics across Language Families provides an interactive map of different pronunciations for various words in dialects across the globe. (Also available in chart form.) If you can't read the IPA, you can listen to the associated sound clip.
Not only is there British English, there's American English and a few other world Englishes. Other parts of the site have other languages.
Some context, from the website description:
Our website offers powerful tools for linguist researchers (to search and filter the database, download all detailed phonetic transcriptions and sound files, create citable links, etc.), but is also multilingual and user-friendly for the general public who actually speak all of these languages, many of them endangered.