I saw your topic was pretty left alone to die.
I'll try to answer your question with as much as I know.
If you want the official newly released DVD's from Japan, it is highly possible that there will be no Subtitles what so ever featured. Though it is possible to get a cheaper version online aswell, though the chance of this being a bootleg disc is at about 99% (bootleg being a copy of an original DVD, though sometimes with additional subtitles but in a lower DVD resolution quality)
At the moment I'm looking for the j-dorama "1 litre no Namida", its was released about 2 months ago on yesasia.com without subtitles, and at a very spicy price (But totally worth it in my opinion) but was some time earlier released on another moviesite zoommovie.com at a much lower price and with subtitles (Apperantly the site has gone down during the last weeks, perhaps it was a smart move to rethink buying from them)
But if you by "Home-market" dvd's mean Japanese DVD's shipped to england and released in stores, I would say, It is possible...
to summarize.. I know shitz about this problem u might be having
, but I would say to you, if it doesn't state on the cover that it includes English subs then it dont. If you don't have a chance at looking at the cover, you just need to think if the movie is so good that it is worth watching without subs.