Student or Learner
On my wall on Facebook has recently appeared a photo from my friend saying: If I had a British accent, I'd never shut up.
Why there is an indefinite article used before a thing that has only one example - clearly from the context it is obvious that they are not comparing various British accents but British, American, Australian etc. Why is 'a' used instead of 'the'? Are both of them possible?
NOT A TEACHER
"The" doesn't work for me. There are many different British accents and the speaker isn't refering to a specific one.