Data included in the SCR include results of two complete seabird censuses of Britain and Ireland: Operation Seafarer (1969/70) and the Seabird Colony Register Census (1985-87), as well as ad-hoc counts and counts from other surveys. Data are held for all 25 species of seabird breeding throughout Britain and Ireland.
The SCR has been partially superseded by the Seabird 2000 database.