Hello Nikos,
except for "STV HD" and "UTV HD", all TV- and Radio-channels at 27.5W - as listed on http://en.kingofsat.net/pos-27.5W.php - can be opened by Dr.HD D15. The only real problem are the subtitles for the TV-channels.
Those channels which may not seem to open are, in fact, data channels like, for example, "BBC Alba" which should not be mistaken for the normal TV-channel "BBC Alba" via Astra2E (28.35E). On the "kingofsat"-site, "data channels" are always marked by a special symbol on the first column on the left. Just take a look at this site: Checking the first column on the left, you will see the difference between TV channels, Radio channels and data channels at first glance.
On "STV HD" and "UTV HD" at 27.5W there are never any TV-broadcasts, and therefore they should not not be labelled as normal "TV"-channels as the "kingofsat"-site does (by mistake). Other satellite directories like "lyngsat" or "flysat" do not list "STV HD" and "UTV HD".
(By the way: The channel listed on "kingofsat" as "BBC HD" is in fact "BBC Two HD", which becomes clear when checking the SID.)
I do not know, if the DVB-S2-PIDs are re-tagged or left unchanched when used for DVB-T-purposes in the UK.
But I do know that on the basis of correct DVB-S2-data (-> descrambled PMT) and valid Control Words (BISS), BBC-Satback-channels at 27.5W can be viewed and recorded along with subtitles. (Scripts by "doublet" for Dreambox-receivers are available in the "openpli"-forum".)
My main concern now is that the development team for Dr.HD firmware actually takes notice of the subtitle problem and that they will do anything about it. But I am afraid that there is not a very good chance of getting any contact.
The original manufacterer ( http://www.dr-hd.com/ ) does not seem to provide any further support and does not reply to E-Mails, which is a very bad sign ...
Obviously, current firmware development (patched software) is provided by a Russian team that may have some connection to the Russian "drhd.legion"-board. For this reason, I have also issued an article about the subtitle problem in the English section of the Russian "drhd.legion"-board - hoping that the Russian development team may read my post. But there is also the problem, if the Russian development team has actually access to relevant parts of Dr.HD-D15 source codes to fix the subtitle problem.
Regards
Anfortas