I've looked a bit more into the Highschool dxd uk release, from what I've learn is that manga Ent has highschool dxd season 1 right for uk and Funimation for USA. Funimation has season 2 right but for some reason it's in limbo at present. I suspect season 2 release issue, probadly has something to do with the spilt that manga Ent & Funimation had. as I believe Manga ent use to be uk distributor for funimation title's. Now there was small period of time when funimation had no uk distributor so title's weren't released in the uk. but when funimation did there deal with anime limited, so that anime limited would be acting as uk distributor for funimation title's we got season 3 of highschool dxd. so maybe reason why we got no season 2 is that it was a part of the manga ent distributing package along with few other title that weren't released in the uk because of the split or some other reason we not aware of.