Removing Numeric Prefix From File Name (Sorry newboy!)

I've read the FAQ, tried using suggestions from previous questions posted but still unable to remove numeric prefix from list MP3 file names e.g

01 Help! [from the Film 'Help! '].mp3

to

Help! [from the Film 'Help! '].mp3

All files in same folder

Felling VERY embarrassed

Trevor

Action: Format value Field : _FILENAME Formatstring: $cutLeft(%_filename%,3)

... or ...

Action: Format value Field : _FILENAME Formatstring: $trimLeft(%_filename%,'0123456789.- ')

DD.20150228.1134.CET