Criterion: the butterfly species by which the individual year is best remembered. Occasionally two species cannot be separated and have to share the title.
| 1964 |
Clouded Yellow |
| 1965 |
Orange-tip |
| 1966 |
Painted Lady |
| 1967 |
Red Admiral |
| 1968 |
Pearl-bordered Fritillary |
| 1969 |
White Admiral |
| 1970 |
Holly Blue |
| 1971 |
Purple Emperor |
| 1972 |
Small Pearl-bordered Fritillary |
| 1973 |
Purple Emperor |
| 1974 |
Purple Hairstreak |
| 1975 |
Purple Emperor |
| 1976 |
Purple Emperor |
| 1977 |
Brown Hairstreak |
| 1978 |
Duke of Burgundy |
| 1979 |
Purple Emperor |
| 1980 |
Silver-spotted Skipper |
| 1981 |
Wall Brown |
| 1982 |
Duke of Burgundy |
| 1983 |
Clouded Yellow & High Brown Fritillary |
| 1984 |
Duke of Burgundy |
| 1985 |
Dark Green Fritillary |
| 1986 |
High Brown Fritillary |
| 1987 |
Small Tortoiseshell |
| 1988 |
Brimstone |
| 1989 |
High Brown Fritillary |
| 1990 |
Holly Blue |
| 1991 |
Meadow Brown |
| 1992 |
Peacock |
| 1993 |
Green Hairstreak |
| 1994 |
Marsh Fritillary |
| 1995 |
Scotch Argus |
| 1996 |
Painted Lady |
| 1997 |
Mountain Ringlet |
| 1998 |
Chalkhill Blue |
| 1999 |
Heath Fritillary |
| 2000 |
Clouded Yellow |
| 2001 |
Purple Emperor |
| 2002 |
Purple Emperor |
| 2003 |
Purple Emperor |
| 2004 |
Pearl-bordered Fritillary |
| 2005 |
Brown Hairstreak |
| 2006 |
Purple Emperor |
| 2007 |
Purple Emperor |
| 2008 |
Purple Emperor |
| 2009 |
Purple Emperor |
| 2010 |
Silver-washed Fritillary & White Admiral |
| 2011 |
Marsh Fritillary |
| 2012 |
Purple Emperor |
| 2013 |
Long-tailed Blue |