| Name | Count | Years active |
|---|---|---|
| Hart-Davis Educational | 286 | 1963-1984 |
| Hart-Davis | 98 | 1964, 1967-1976, 1978-1983 |
| Collins Educational | 40 | 1964-1965, 1980, 1983-1985 |
| Hart-Davis Educ | 26 | 1963-1964, 1966-1967, 1970 |
| Granada | 19 | 1981 |
| Hart-Davis Educational for Granada Television | 17 | 1980-1981 |
| Collins | 4 | 1983-1984 |
| (Hart-Davis Educational) | 4 | 1978 |
| Hart-Davis Educ. | 4 | 1965, 1974, 1982 |
| Hart-Davis Educational. | 3 | 1964 |