Most non-rhotic speakers - which is a term for people who "drop the R sound" after a vowel - bring that R sound back if that word goes into a vowel sound at the beginning of the word that follows. For example: fair can sound like "feah" in a non-rhotic accent, but when you say the phrase fair enough, the R may come back in, so that it sound like feah-renough - almost as though the R is attached to the word that follows. Jim leads you through this idea here:
