The Bletchley Circle Episode Ratings Heatmap
2012 · 2 Seasons · 7 Episodes · Overall Score: 7.3/10 (7 rated)
Season 1 holds the highest collective average score across the series.
Season 1 Details →Lowest score variance (σ = 0.06), maintaining an average of 7.2.
Complete Episode Rating Matrix
Interactive score chart by season and episode number. Darker green indicates higher ratings; amber and red denote lower reception.
Ratings Analysis & Trajectory
Across 2 seasons and 7 episodes, The Bletchley Circle has earned an overall series rating of 7.3 out of 10. The series displays remarkable consistency across its narrative arc, maintaining reliable ratings from premiere to conclusion.
The single highest-rated hour of television in the series is Season 1, Episode 2 ("Cracking a Killer's Code (2)"), rated at an extraordinary 7.8/10 with 13 ratings. Conversely, the lowest-rated installment is Season 2, Episode 4 ("Uncustomed Goods (2)"), landing at 7.1/10.
The most precipitous single-episode shift occurred in Season 1 between Episode 2 ("Cracking a Killer's Code (2)", 7.8) and Episode 3 ("Cracking a Killer's Code (3)", 7.3), a swing of 0.5 points.
Top 10 Highest Rated Episodes of The Bletchley Circle
| Rank | Episode | Title | Score | Votes | Air Date |
|---|---|---|---|---|---|
| #1 | Season 1, Ep 2 | Cracking a Killer's Code (2) | 7.8 | 13 | Sep 13, 2012 |
| #2 | Season 1, Ep 3 | Cracking a Killer's Code (3) | 7.3 | 11 | Sep 20, 2012 |
| #3 | Season 1, Ep 1 | Cracking a Killer's Code (1) | 7.2 | 12 | Sep 6, 2012 |
| #4 | Season 2, Ep 1 | Blood on Their Hands (1) | 7.2 | 12 | Jan 6, 2014 |
| #5 | Season 2, Ep 3 | Uncustomed Goods (1) | 7.2 | 10 | Jan 20, 2014 |
| #6 | Season 2, Ep 2 | Blood on Their Hands (2) | 7.1 | 11 | Jan 13, 2014 |
| #7 | Season 2, Ep 4 | Uncustomed Goods (2) | 7.1 | 8 | Jan 27, 2014 |