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A grey partridge can be seen waiting for more chicks to hatch, while tucked away in its nest built out of tightly woven grass is a chiffchaff.

In Europe, the cuckoo, blackcap, wren and chiffchaff fly up the list.

Many resident bird species are rising in numbers; as are short-distance migrants such as the blackcap and chiffchaff.

Elf, who goes by a teenage nickname that stuck, says if the show, “ChiffChaff”, has a serious approach to economics, it is to give the audience “a new relationship to that word”.

He was the first person to identify the chiffchaff, willow warbler and woodwarbler as three distinct species based on their songs.