dialect

Jones also had to swap her British accent out for a thick, distinctive Delco accent, as the dialect spoken by those from Delaware County is affectionately called.

She has to know the city, its peoples, dialects, and languages.

The 37-year-old former Doctor Who star, who grew up in Inverness, posted on Instagram that "my dialect coach can sit this one out".

"It betrays your class. It betrays your origin. All over the world people are trying to reclaim accents and dialects that have been lost."

I had a great dialect coach called Jude McSpadden who was fantastic, and she kept me on track.