@mark654:
If you will do it as described above, you will see subtitles as UND (undefined) so language priority settings will not be used.
To tag subtitles with correct language code, use:
Moviename.EN.srt or Moviename.ENG.srt (2char/3char specification - correct codes can be found via GOOGLE)
If you are using forced subs, you can use something like Moviename.EN-forced.srt
