| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | Episode 1 |
April 9, 2012
BBC One
|
30 | |
| S04E02 | Episode 2 |
April 10, 2012
BBC One
|
30 | |
| S04E03 | Episode 3 |
April 11, 2012
BBC One
|
30 | |
| S04E04 | Episode 4 |
April 12, 2012
BBC One
|
30 | |
| S04E05 | Episode 5 |
April 13, 2012
BBC One
|
30 | |
| S04E06 | Episode 6 |
April 20, 2012
BBC One
|
30 | |
| S04E07 | Episode 7 |
April 27, 2012
BBC One
|
30 | |
| S04E08 | Episode 8 |
May 4, 2012
BBC One
|
30 | |
| S04E09 | Episode 9 |
May 11, 2012
BBC One
|
30 | |
| S04E10 | Episode 10 |
May 18, 2012
BBC One
|
30 | |
| S04E11 | Episode 11 |
May 25, 2012
BBC One
|
30 | |
| S04E12 | Episode 12 |
June 1, 2012
BBC One
|
30 | |
| S04E13 |
Episode 13
season finale
|
June 4, 2012
BBC One
|
30 |
No artwork of this type.
No artwork of this type.
