Ash and Machin are recalled to London from a bomb disposal course and attend to a bomb in a school yard that is dangerously close to a telephone exchange. When another bomb is uncovered close by, Ash reluctantly allows Machin to defuse the his first bomb.
| Name | Type | Role | |
|---|---|---|---|
| Jeremy Paul | Writer | ||
| Patsy Smart | Guest Star | ||
| Prentis Hancock | Guest Star | ||
| Roy Ward Baker | Director |