I'm a little curious as to what the police did to try to find her. It was summer, so people would be around and it would be light about 20 hours a day. On the other hand, vegetation grows fast. Asking about purchases of gardening tools. Checking CCTV footage of big garden centres for someone checking out a spade. Someone buying a map. Asking people working in the area to look out for signs of car tyres where there shouldn't be any. If does sound as if he nearly came to grief with his car. What about his clothes, were they too late to rescue anything from the washing machine? Probably. I wonder what his wife had to say about his behaviour over these few days?
I agree he should probably have been cautioned earlier than he was. Carloway is trying to fudge that in my opinion. Maybe that's what the new appeal to SCCRC is all about. Well going by what I've heard, it's going to take more than a technicality of when the accused was cautioned to get them to make a referral. They've actually got to be convinced that there's a realistic chance of the appeal succeeding, and that it's in the public interest for the appeal to go ahead (that "certainty and finality" thing).
Yes, the appeal judgement did note that he relied on the statements he gave to the police rather than give evidence in his own trial. As Carloway said, without these statements, unless he'd given evidence, he'd have had no defence other than the presumption of innocence.