On some detail points above - the Wardo Avenue bike contract note most likely simply means "remember to bike over to the owner of that house in Wardo the contract whereby we're retained to sell his / her house".
Her imminent commission of £3,000 was quite likely just the ordinary sales commission on dwellings she'd sold. She talked about this on Saturday 26th July and payday was the following Thursday, the 31st (end of the month). Estate agents then charged about 2% commission, of which the one who won the instruction and the one whose buyer exchanged on the property would get 15%, i.e. 0.3% for either slice. My source for this is a friend who was an EA nearby in 1990; that was his pay structure. A commission of £3,000 is thus her slice of £1 million of property, which is about six or seven houses / flats - or fewer than that if she also won the instruction. The fact that she had a diary note to bike a contract round suggests that she did get involved in winning instructions as well as selling.
How blonde SJL actually was is a matter of opinion. The last (IIRC) photo taken of her was at the 21st birthday party she went to on Saturday, in which she doesn't look that blonde at all. This was right after the blonding was done. It was the family, conducting their own press conferences in their back garden, who unleashed all the brunette photos that so muddied the waters. While she certainly looks very pretty in many of them, it is not clear how representative they were.
It's instructive to compare some of the photos of her and look at her face and build. In some, she is decidedly jowly. In others, she is exceedingly svelte. It has been suggested she was slimming rapidly at the time; one wonders why. When women do this it is quite often new-bloke-related.
AS did indeed have access to the police files. As the police failed to find any killer until the press and the family told them it was Cannan, you wonder what special insight the files gave, if any. We can hazard a guess at what was omitted from the book from the comments about the News of the World quality of that material, the money offered for it and the hints left in AS. Without saying so expressly he indicates that she was four-timing AL - besides him there was DH, her persistent ex, someone she slept with the previous weekend and from memory one other besides. He'd been on holiday for a week but she promptly blanked him all weekend: very unfriendly. They should have been all over each other on the Friday.
The implication I draw is that she was yours for as long as you paid generously for everything; i.e. she was not "tomming it" but she was highly available to open-handed prosperous men, including married ones, whether she was herself ostensibly attached or not. This was still a thing in the 1980s - I knew many young women who spent literally nothing on their social life because they could get all of it paid for by their boyfriends.
This stuff was kept out because ultimately, DL was more concerned to preserve SJL's reputation than to find her killer. If - 100% hypothetically, this is not the true position - but if convicting SJL's killer would have revealed that she had been working as a hooker, DL in that case would have rather seen the case left unsolved.
This probably explains IMO AL's white lie to DV that he and SJL had never been to the PoW. In 1986 his story was that they went there on Friday and her stuff went missing. But the landlord is adamant her stuff was found on Sunday, in which case she was not there with AL at all. She'd already dumped him, but as a favour to DL and perhaps because he genuinely liked SJL, he tactfully misrepped what happened. I like him for doing this, even though it's unhelpful.
There is a much, much better possible case against Cannan, but it's not the one trotted out by the police, which relies on insinuation, misdirection and decades-old hearsay that's never admitted to as such. The publicly-made case against Cannan is based on this nonsense because it enables the police to say they only found out who did it years later. There were in fact many pointers to Cannan at the time, which they failed to follow up. The real case against him could have been made in 1986/7 and Shirley Banks would still be alive. One notable point is that AR, his married solicitor girlfriend, apparently remembered Cannan mentioning SJL to her before she disappeared. She reported these conversations to the police after she did so, and the police did nothing about it. They can't admit this, so that's why it's all "I saw Cannan looking in the window" 14 years after the fact. JMO.
Sandra Court is puzzling, but on balance Cannan probably did it IMO. Her belongings were scattered along the roadside at intervals of miles. If you plot where they were found, it's consistent with a logical route towards the M3 and back to London.
DV has done a good job picking apart "facts" that are often simply unacknowledged assumptions at the time. E.g HR is an unreliable witness whose minimum, least contentious claim is that he heard 37SR's door slam and saw 2 people coming out. When the police entered 37SR, they thought that nobody had been inside that day and they found no evidence SJL had ever been inside (if they had we'd know about it). With or without the keys, she never went inside, so HR's account is demonstrably embellished. Between DV's lines, it was MG who forgot to mention to the police that the keys they used to get in were the only set they had.
A point brought up but not parsed by DV is the odd behaviour of "CV" (= KH) in 1986. While the landlord MH is away, with CV in charge, the police visit the pub to retrieve the belongings of the country's most famous missing person, who's all over the press. When MH gets back, CV said....absolutely nothing. The first MH heard of the police visit was when they turned up a year later for a close-off chat and find that MH was not the landlord they'd spoken to a year before. Which is pretty odd - the first thing MH is going to say on his return would be "How did it go then? Any dramas?" To which CV evidently said "Nah, all quiet" and completely failed to mention the pub's role in a major news story. Eh?
There are three major problems with DV's alternative hypothesis. First, he glosses over the pub's floor having been lowered in the 1990s. How could you do that and not notice a body? Concealment on the embankment is more likely as the pub floor scenario would implicate a single person. On the embankment, she could have been put there by anyone. Second, without saying why, he ignores the BW sighting, which was by someone who knew her and which blows his pub scenario apart. Third, he ignores all the information laid against Cannan by JT, who had a flat within walking distance of 37SR.
DW strikes me as a waste of time to listen to. I've never heard him say anything he wasn't simply repeating from one of the many identical documentaries.
I've often wondered if the relationship with AR was going on while JC was still in the Scrubs. If this is the case, and JC was able to (presumably) travel to Bristol to meet with her whilst supposedly under curfew, it perhaps points to the supervision at the Scrubs perhaps being pretty liberal. It also lends some credibility to the Bristol Businessman theory (I'd discounted that on the basis that he did not move to Bristol until some time after his release, according to most sources). 
