I agree that this is very much more interesting if 'collected', 'selected' and 'complete' are all excluded.
Interesting to claim that only writers of light verse compose their works as books. Perhaps that should give pause to those who would down-grade their work? In any case, I'm not so sure that the contention is true. I could certainly nominate one rather than the rest of Larkin's books (I'm not about to) and I can think of other distinguished examples including Eliot, Dylan Thomas and, of course if he was admissable (which as he was writing in Scots he is not) MacDiarmid.
Over to the thread's originator on this one.