Unfortunately for this "updated" documentary about the disappearance of Suzy Lamplugh, it was launched three months after an almost identical superior production from Channel 5, also revealing the alleged "new" and never acted-on canal deposition evidence.
At two episodes, it is too long and ploddy, and It reveals, like all previous documentaries, that the Metropolitan Police were slow to act and lost vital information, had at least three officers in charge (including the re-investigation) and were prejudice against certain suspects in the late eighties. They had (and have) a fixed scenario of events at the time and this has never changed, even though a retired police officer have offered an alternative suspect and scenario in recent years.
For any person interested in the case, and viewed previous documentaries, there is very little new worth viewing, the documentary has retained the same clips and police officers that have been used previously in "Real Crime" 2001 and "Crimes That Shook Britain" 2008, although included in this film are narrative excerpts from Suzy's Diary and the excellent book by Andrew Stephen (which is more informative than any film documentary on the subject).
A fresh look at her disappearance is required, with a more in-depth investigative approach, and I would have preferred a possible new scenario being played out by the producers, instead of the retired case police officers fixed rhetoric.