| Name | Character | Episodes |
|---|---|---|
| John Burgess | Duggie Webber | 45 |
| Kathleen Byron | Martha Finch | 43 |
| Delena Kidd | Sarah Cunningham | 27 |
| Stephen Churchett | Peter Hunt | 26 |
| Raymond Francis | Edward Fuller | 25 |
| Gillian Bailey | Julie Dunn | 21 |
| Victor Maddern | Harry Klein | 20 |
| Margaretta Scott | Daphne Porter | 20 |
| Hilda Fenemore | Dora Klein | 20 |
| Carol Hawkins | Susi Powell | 20 |
| Christopher Burgess | Leslie Shepherd | 18 |
| Sarah Greene | Tricia Webber | 16 |
| John Malcolm | Arthur Sutton | 15 |
| Patsy Smart | Amy Barratt | 4 |
| Daniel Abineri | Tony Sutton | 4 |
| Alan David | Russell Patterson | 3 |
| Frances Cuka | Marge Frisby | 2 |
| Jamila Massey | Dr. Prati Chaudhuri | 2 |
| Barry Lowe | Mr. Mallory | 2 |
| David Hargreaves | David Cunningham | 1 |
| Sharon Maiden | Sally Kenyon | 1 |
| Eric Richard | Dave Spencer | 1 |
| David Quilter | RSPCA Inspector | 1 |
| Blake Butler | Mr. Piercefield | 1 |
| Anne Ridler | Mrs. Mallory | 1 |
| Pam St. Clement | Noreen Mullin | 1 |