Sub-titles, please

I note that on both the terrestrial English-language television channels, Chinese subtitles are frequently provided for films and popular imported shows from the United States and Britain. Why can't this be reciprocated on ATV Home or TVB Jade? I have many friends who would be keen to follow the many Cantonese-language dramas and martial-arts epics that dominate these channels, but are not fluent enough in Cantonese.

S. OSTHEIMER

Quarry Bay