We don't know any details about what it was that made greybeard stop his car and check that Libby was ok do we? I'm now wondering if he saw her talking to a 'man' (not naming names here) and sensed that something wasn't quite right. The 'man' may then have wandered off (aka sat and had a *advertiser censored*) whilst waiting for greybeard to go away... and then returned to hassle Libby.
Also... since the police clearly don't mind appealing for witnesses who were around that night, it's odd that they haven't asked spiderman to come forward. I know others have already said this, but it does look like they know who spiderman is. Whether it's PR is another matter.
And lastly - I'm not sure why people are saying there was a gap in PR's alleged offending (ie. nothing in 2017). As far as I can make out the offences happened on the following dates:
Dec 4th 2017 (Monday) Theft of Playstation stuff and £25 Lambton Street
Jan 23 2018 (Tuesday) Voyeurism, Etstuary Street
Jan 19th 2019 (Sat) Masturbating in a public place (street?)
Jan 25th - 28th 2019 (Fri-Mon) Trespass, theft of laptop, kindle, speaker, sex toys, condoms and photographs. Ventnor street. (Sounds like the occupants may have been away for the weekend, hence the non-specific dates).
There's also the events of December 26th 2018 (flashing and peering through the window) on Wellesley Street, right?
Have I missed anything?
It does seem he favours the period around Christmas doesn't it? although of course there may be other unreported incidents.