Can be listened to here.
(An excellent site by the way, for anyone interested in philosophy).
I once sat at Don Cupitt's feet, listening to him give his spiel, which I was rather interested in at the time. As, in the course of the conversation, it became very clear that he had no understanding of the mystical tradition from the inside I lost interest in his point of view. Might be time for a reassessment.
NB my view on non-realism is the same as Wittgenstein's: (paraphrase from memory) 'one man is a convinced realist, another a convinced idealist, and each teaches his child to cross the road accordingly'.