| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | Episode 1 |
January 10, 2019
BBC Two
|
60 | |
| S04E02 | Episode 2 |
January 17, 2019
BBC Two
|
60 | |
| S04E03 | Episode 3 |
January 24, 2019
BBC Two
|
60 | |
| S04E04 | Episode 4 |
January 31, 2019
BBC Two
|
60 | |
| S04E05 | Episode 5 |
February 7, 2019
BBC Two
|
60 | |
| S04E06 |
Episode 6
season finale
|
February 14, 2019
BBC Two
|
60 |
No artwork of this type.
No artwork of this type.
No artwork of this type.