I'm using 13 east italian channels. I'm trying the image you suggest with oscam and if i record one subbed channel i can watch only free channels. If i try to watch another sub channel, the result is black screen but oscam send all data to smartcard but it works with two channel on the same transponder. Is the same for you? Probably HDMU works on 28.2 east uk channels too. I don't have test it.
Thanks.