| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | Episode 1 |
January 7, 2009
BBC One
|
87 | |
| S04E02 | Episode 2 |
January 14, 2009
BBC One
|
59 | |
| S04E03 | Episode 3 |
January 21, 2009
BBC One
|
59 | |
| S04E04 | Episode 4 |
January 28, 2009
BBC One
|
59 | |
| S04E05 | Episode 5 |
February 4, 2009
BBC One
|
59 | |
| S04E06 | Episode 6 |
February 11, 2009
BBC One
|
59 | |
| S04E07 | Episode 7 |
February 18, 2009
BBC One
|
59 | |
| S04E08 | Episode 8 |
February 25, 2009
BBC One
|
58 | |
| S04E09 | Episode 9 |
March 4, 2009
BBC One
|
59 | |
| S04E10 | Episode 10 |
March 11, 2009
BBC One
|
59 | |
| S04E11 | Episode 11 |
March 18, 2009
BBC One
|
59 | |
| S04E12 | Episode 12 |
March 25, 2009
BBC One
|
58 | |
| S04E13 | Episode 13 |
April 1, 2009
BBC One
|
59 | |
| S04E14 | Episode 14 |
April 8, 2009
BBC One
|
59 | |
| S04E15 | Episode 15 |
April 15, 2009
BBC One
|
59 | |
| S04E16 | Episode 16 |
April 22, 2009
BBC One
|
59 | |
| S04E17 | Episode 17 |
April 29, 2009
BBC One
|
59 | |
| S04E18 | Episode 18 |
May 6, 2009
BBC One
|
58 | |
| S04E19 | Episode 19 |
May 13, 2009
BBC One
|
57 | |
| S04E20 |
Episode 20
season finale
|
May 20, 2009
BBC One
|
59 |
No artwork of this type.
No artwork of this type.