
2002 – 2011
86 Episodes
60 min
| Ep 1 | Ep 2 | Ep 3 | Ep 4 | Ep 5 | Ep 6 | Ep 7 | Ep 8 | Ep 9 | Ep 10 | |
|---|---|---|---|---|---|---|---|---|---|---|
| S1 | 7.2 | 9.0 | 8.6 | 8.2 | 8.4 | 8.8 | ||||
| S2 | 8.6 | 9.2 | 8.4 | 8.2 | 8.8 | 8.2 | 8.4 | 8.5 | 8.4 | 9.2 |
| S3 | 9.0 | 8.8 | 8.0 | 8.8 | 7.8 | 8.8 | 8.5 | 8.8 | 8.2 | 9.2 |
| S4 | 8.8 | 9.0 | 8.2 | 9.0 | 8.5 | 9.0 | 8.8 | 8.8 | 9.0 | 9.0 |
| S5 | 8.6 | 7.8 | 9.2 | 8.5 | 8.8 | 8.8 | 9.0 | 9.5 | 9.0 | 8.7 |
| S6 | 9.5 | 9.5 | 9.5 | 9.5 | 5.2 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 |
| S7 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.7 | 9.5 | ||
| S8 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 8.7 | 9.5 | 9.5 | ||
| S9 | 8.3 | 9.5 | 9.5 | 8.7 | 9.5 | 9.5 | 9.5 | 9.5 | ||
| S10 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 | 9.5 |
Tense drama series about the different challenges faced by the British Security Service as they work against the clock to safeguard the nation. The title is a popular colloquialism for spies, and the series follows the work of a group of MI5 officers based at the service's Thames House headquarters, in a highly secure suite of offices known as The Grid.