I would love to hear Beacroft's reasoning for not believing FM saying he'd disappeared right before FD got home. Also Beacroft wasn't present when it happened (but FM and her mother were), so on what and how is she basing her theory of the time on? If PS had taken W from the neighbour's property half an hour before his wife left for bingo, where and how did he hide W for that half hour and how did he keep him quiet so as not to rouse his wife's suspicion that he'd stolen the neighbour's child? Then, after his wife left, what did he do with W then? Put tape on his mouth and hide him in a secret place in his house that for sure wouldn't be searched? (Police even opened up neighbour's attic accesses to check into them.)
If he made W unconscious, then how did he know that by the time W came to, and started screaming as he surely would be expected to, all the fuss on the street would be gone and nobody would hear him? (It wasn't, and they would have). We know his vehicle(s) was examined forensically, so he didn't take him anywhere in his vehicle(s). So if not unconscious, then did he kill him right away before his wife even left? And if so, why? The sheer logistics and circumstances here seem to suggest that it just wasn't possible for PS to have taken him and gotten away with it for five plus years?