I hope everybody here doesn't mind Fox adding her bit.
I'd just like to say IMO Cannon has nothing to do with the case and he's just yanking everyone's chain. He likes an audience, not privacy with his victim. Whatever, whoever he dumped in the River Brent, wasn't Suzy...
Mr Kipper - just a Red Herring? Jack the Kipper?
I reckon it was a local, which can mean any of the shifting population of people in the flats and bedsits of the area, because Fulham is a bit of a backwater. You don't go shopping on Fulham High Street unless you are nearby - Fulham's nice, it's just not a South Ken or Knightsbridge shopping destination. So you won't see Suzy in Sturgis's window unless you work or live nearby.
Work in Fulham? Then you come in on the Tube. Another side-line. Fulham is one of only 9 stations on the Wimbledon branch of the District Line. It's possible that Kipper came in from the wider commuter belt but I don't think so, as he appears to have connections with Fulham Football club - languishing in the Third division in 1986, so either a rival or a fan. Suzy almost certainly caught the tube from Putney East, because her flat was just 350 yards away. Maybe Kipper saw her on the tube. Regular commuter, familiar face...probably never registered with Suzy.
12:45 appointment. She'd never be missed until 2:00 at least...
I trust that the police investigated the witness thoroughly...so onto Kipper.
A very well-dressed guy and that portrait gives him a certain je ne sais quoi. I can see why Suzy got into a car with him, maybe agreed to continue negotiations over lunch at some out-of-town location. She'll drive because he left his car and came on the tube...if Suzy drives, then Kipper can take control easily...
Now I have a "Type" for Kipper. He's a sociopath and a narcissist, very attractive to the ladies, able to give the appearance of a well-to-do man of the upper middle classes, like Malcolm John Webster, maybe even in a similar job [A nurse] ...Websters victims were plied with drugs first. It isn't always a claw hammer to the head in these crimes. Webster wasn't available 28.7.1986...but he was a good ringer for the age bracket. I'm thinking Kipper was between 2 and 8 years older than Suzy - just enough to give him seniority i.e. 28-36 years old. Actually, its a real nuisance Webster was out of the country in '86, because in his younger days he had a good resemblance to Kipper...in this pic he's still too old
I have more thoughts, but if I make the post too long nobody will read it!