Two left to finish:
12a Checks acts designed to get publicity (6) S---T-
2d Unprepared, not operating with screen (3,5) O-F---R-
2d is presumably "off" something but I just don't see it!
And I'm struggling to parse 25a Opening home with key, not against letting one in (7).
I've got "initial" and am ok with the "home" = "in" bit and the "letting one in", but can't get the rest!