Rhoticity: When to pronounce the R in a standard British English Accent || Source: English Pronunciation Roadmap(YT)

 Rhoticity is about when to pronounce an 'r' sound.

Car 

Heard

Standard

Here

North

In Standard Southern British English accent. 

Only pronounce an 'r' if it comes before a spoken vowel sound. 

~ red (r is pronounced)

~ oo sound, rude (r is pronounced)

~ Caring.