First draft
Episodes were shown on11 May as follows:
| Episode | Year |
| EF0320 | 1976 (Series 4) |
| EF0448 | 1978 (Series 6) |
| EF0731 | 1982 (Series 10) |
| EF1247 | 1988 (Series 16) |
| EF1350 | 1989 (Series 17) |
| 01763 | 1993 (Series 21) |
| 01972 | 1995 (Series 23) |
| 02521 | 1999 (1 Hour Special) |
| 02691 | 2000 |
| 02914 | 2001 |
| 03437 | 2003 |
| 03736 | 2004 |
| 04047 | 2005 |
| 04359 | 2006 |
| 04674 | 2007 |
| 05291 | 2009 |
| 05605 | 2010 |
| 05917 | 2011 |
| 06235 | 2012 |