It is sometimes hard to tell when to call a composer modern, as opposed to Romantic. In general you can say that the Moder Eara in music started around the year 1900. However, many composers continued to write pieces in a romantic fashion long after that.
Composers that were born in England, or gained the English nationality.
A listing of composers that have also been conductors as part of their professional career.
Composers that created music for the purpose of being used in a film, either as a main occupation, on a regular basis, or for an important film.
Not included are those composers whose music was used for films, but was not specially written for that purpose.