In early December 2019, Reddit identified what they refer to as 'coordinated behavior', FaceBook have a great primer on it here

Whilst the document content themselves where not very interesting, the 'secondary infektion', a term explained here was a well worn technique developed to manipulate public opinion/emotion. I took a look at the documents, and identified the following:

Document metadata which points to a potential day and time of a meeting where the notes took place.
Document Metadata that points to EDT timezone

The UK was about to vote in a general election which would likely form a strong opinion on Brexit, this made for a good target for the 'secondary infektion'. Firstly, the documents are marked 'OFFICIAL - SENSITIVE', so i won't be linking to them. However the document metadata is curious enough to warrant further analysis.

The zip file contain 6 PDF files of which 4 contained Author data:

Schneider Rebecca (Trade);Anna-Marie Lee
Schneider Rebecca (Trade)
Anna-Marie Lee
Oliver Griffiths

A cursory Google of the following names identifies them as appropriate professionals associated with Trade and Government status.

All the documents have a modified time stamp of:

Mon 29 Jul 2019 12∶35∶58 PM EDT
Mon 29 Jul 2019 12∶40∶52 PM EDT
Mon 29 Jul 2019 12∶40∶02 PM EDT
Mon 29 Jul 2019 12∶36∶42 PM EDT
Mon 29 Jul 2019 12∶36∶54 PM EDT
Mon 29 Jul 2019 12∶39∶06 PM EDT

EDT stands for EDT, which is 4 hrs behind UTC, which would fall (largely) on the US East Coast.

https://www.timeanddate.com/time/zones/edt

July 29th UK News was largly dominated by Brexit headlines https://www.expressandstar.com/news/uk-news/2019/07/29/what-the-papers-say-july-29/ which would suit the agenda for 'secondary infektion'. What is more interesting is the date of the created/modified timestamps.

Created: Thu 18 Jul 2019 10:20:02 AM EDT Modified: Thu 18 Jul 2019 10:20:02 AM EDT
Created: Thu 18 Jul 2019 10:17:26 AM EDT Modified: Thu 18 Jul 2019 10:17:26 AM EDT
Created: Thu 18 Jul 2019 10:18:39 AM EDT Modified: Thu 18 Jul 2019 10:18:39 AM EDT
Created: Thu 18 Jul 2019 10:17:49 AM EDT Modified: Thu 18 Jul 2019 10:17:49 AM EDT
Created: Thu 18 Jul 2019 10:30:25 AM EDT Modified: Thu 18 Jul 2019 10:30:25 AM EDT
Created: Thu 18 Jul 2019 10:18:08 AM EDT Modified: Thu 18 Jul 2019 10:18:08 AM EDT

Nothing too strange about this, but the date was interesting given that UK Parliament was in recess, i wondered where and how these documents had been created by Government officials if they had been in recess.

These dates would correlate somewhat curiously with the following meeting(s) in the Palace of Westminster:

http://services.parliament.uk/Calendar/Lords/MainChamber/2019/7/29/week.html#!/Calendar/Lords/SelectCommittee/2019/7/18/events.html

A meeting titled:

EU External Affairs Sub-Committee
Subject: Private Meeting
Location: Room 1, Palace of Westminster

10am start? - Curious indeed.

Some further anomalies exist in the metadata in that the Format differences between documents which is to be expected given the multiple authors and last modified stamps:

PDF-1.7 (Initial Release 2006)
PDF-1.5 (Initial Release 2003)

I don't fully understand why there are differences between some of the document Format versions, according to the specification there is no discernible differences as far as i can tell( i am open to being told otherwise)

In summary, the documents leaked have could have been modified during a potential meeting in Westminster by a device/laptop which had a EDT timezone, this is purely speculative given the relative ease in which this kind of metadata can be altered at will to suit the agenda but is certainly not beyond the realms of truth.