Budleija is fine but has a short flowering season and will take over the
garden.
I have found the last 2 or 3 years that Single dahlias(Not those with full
closed flowers) are very good feed plants for bees, hover flies and
Butterflies. and can last in flower from July till the frost cuts them down,
also Helichrisum (Everlasting flower) is another good long lasting feed
plant that doesn't take up to much space (You could plant clumps of 8 or 9
plants in different parts of your garden).

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk