First draft
Episodes were shown on 15 May as follows:
| Episode | Year |
| EF0060 | 1973 (Series 1) |
| EF0527 | 1979 (Series 7) |
| EF0580 | 1980 (Series 8) |
| EF0879 | 1984 (Series 12) |
| EF1049 | 1986 (Series 14) |
| 01454 | 1990 (Series 18) |
| 02205 | 1997 |
| 02362 | 1998 |
| 02916 | 2001 |
| 03178 | 2002 |
| 03441 | 2003 |
| 04050 | 2005 |
| 04362 | 2006 |
| 04676 | 2007 |
| 04986 | 2008 |
| 04987 | 2008 |
| 05296 | 2009 |
| 06238 | 2012 |