Thank you so much bednobs, I would never have noticed that little [S] box, I am eternally grateful to you as it is awful when you can't hear properly. The facility isn't there for CJ but is for most programmes.
you are welcome. My mum always had the subtitles on when i lived at home and although i don't have a hearing impairment, i much prefer watching programmes with subtitles (out of habit i suppose!) Except for live or news programmes - the subtitles just annoy me then!