The witnesses were shown a video compilation, which included JC and he was positively identified. Sound may not have been used unless the witness heard JC speak when she saw him.
The original JC dating agency interview was shown on regional TV programme (HTV West - covering Bristol and the West Country) on the evening that JC was jailed for the murder of Shirley Banks, 28th April 1989.
The Operation Phoebus re-investigation team will have been exceptionally thorough in assessing the witnesses potential exposure to the regional TV programme and any wider circulation before 2000, which they will have established. Any likelihood of compromise will need to have been recorded and disclosed to the defence, in any subsequent prosecution.
This identification related to JC engaged in what seems like an an innocuous act, i.e. looking in an estate agents window in Fulham, is circumstantial evidence. In and of itself it is easily dismissed, but collectively with all the other evidence it supports JC being involved in SJL's disappearance.
The witness will have initially provided a statement of what she observed on that day and been asked to describe JC, and her reasons for remembering him, which of course would carry significant importance after an elapsed time of 14 years.
Only after this will the video identification procedure have been conducted in accordance with PACE 1984, by an identification procedure trained officer, entirely independent of the investigation.
Here is the original HTV West extended news article. It goes into significant depth about the dating video and the JC's offender profile.
JMO
I don’t understand how she claims he came across as fairly aggressive but he was a nice person.
I guess if you dress well and have a posh accent coming across as fairly Aggressive is somehow acceptable.
Moooo