Ihave a Bush DLC01902 television and all is working well but the instructions on the screen etc are in Spanish and I can't work out where to change them

If you want to change the language of the menu, look for "idioma" or "lengua." Both mean "language" in Spanish.

I have a Bush 42" A642N which should play from a USB Flash Drive. I have films on the drive which is inserted in the back of the TV and the Screen shows that the files are on there, but cannot start them - is there some other button on the remote that starts the films.

It may be the format of the film ,witch can not play through your TV ,try downloading films and typing in xvid after your choice of film this should play through your TV ,it worked for me