| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | Wrexham Blowdown |
March 23, 2021
Quest
|
45 | |
| S04E02 | George Hotel |
March 30, 2021
Quest
|
60 | |
| S04E03 | Anzani House |
April 6, 2021
Quest
|
60 | |
| S04E04 | Wilton Park |
April 13, 2021
Quest
|
45 | |
| S04E05 | Defunct Depot |
April 20, 2021
Quest
|
45 | |
| S04E06 | School Shutdown |
April 27, 2021
Quest
|
45 | |
| S04E07 | Five Towers |
May 4, 2021
Quest
|
45 | |
| S04E08 | Warfare Recycle |
May 11, 2021
Quest
|
45 | |
| S04E09 | Swimming Pool |
May 18, 2021
Quest
|
45 | |
| S04E10 | Hammering Home |
April 25, 2021
Quest
|
45 | |
| S04E11 | Rugeley Chimney |
May 2, 2021
Quest
|
45 | |
| S04E12 | Episode 12 |
May 2, 2021
Quest
|
60 | |
| S04E13 | Episode 13 |
May 9, 2021
Quest
|
60 | |
| S04E14 | Episode 14 |
May 16, 2021
Quest
|
60 | |
| S04E15 | Episode 15 |
May 23, 2021
Quest
|
60 | |
| S04E16 | Episode 16 |
May 30, 2021
Quest
|
60 | |
| S04E17 | Episode 17 |
June 6, 2021
Quest
|
60 | |
| S04E18 | Episode 18 |
June 13, 2021
Quest
|
60 | |
| S04E19 | Episode 19 |
June 20, 2021
Quest
|
60 | |
| S04E20 |
Episode 20
series finale
|
June 27, 2021
Quest
|
60 |
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