Torchwood w/narrated audio tracks for the visually impaired?

I know that on some of the region 2 Doctor Who blurays/dvds there are audio tracks you can enable for the visually impaired that have brief perfunctory narration of what's happening on-screen. I was wondering if anyone knew if/where such things exist for Torchwood. And if any of said hypothetical sources would be easily available to a US citizen.

Thanks.