In England, rhoticity is rapidly declining, and confined to the Southwest and some parts of Lancashire. This speaker, a farmer from rural North Yorkshire, is probably one of the few remaining speakers of rhotic English outside these two regions.

The Rhotic R (American R)

Rhoticity in English - Alchetron, The Free Social Encyclopedia

Rhoticity

Social Issues | Definition, Causes & Examples

BBC Learning English - The Pronunciation Lounge / British and American /r/