The R sound in English is so variable. The most common execution of this letter is a retroflexive one. But there are accents in which people use a tapped one instead. A good example is Scottish English, that is known by the strong tapped R.
I can tell that many people from Scotland, Northern Ireland and Wales tap the R. Is this a feature inherited from the Celtic languages that used to be spoken in these countries? Is this an accent more typical of the countryside? Are there accents with tapped R in the USA or Canada?
I hope some native speakers can help me. Thank you in advance.