awiouy
Apologies for not responding sooner, everything is working absolutely perfectly, you are an absolute star 
For anyone installing Webgrab++ as LibrELEC Addon (Which takes any pain out of install and having a basic pre-running setup of Webgrab++)
I would recommend reading jumping right to Webgrab++ Configuration Howto to appreciate power and I believe simplisity of Webgrab++
OK on to my current setting-up method :-
Copy required channels.xml & associated .ini into the Userdata/addon_data/service.webgrabplus (for country(s) of interest.
Modify Webgrab++.config.xml to include the specific channels of interest you wish to grab epg information on.
If we are running Webgrab++ on same device that we want to view EPG and subsequently watch the channels, Webgrab++ alters any country time zone differences on the fly to be aligned with time zone set on the device 
So then we just read guide.xml output "using a XMLTV reader of choice" after Webgrab++ run is complete. (i.e. Kodi TV Guide addon)
However, if we plan to transfer guide.xml to a remote device that has a different time zone setting, then timings for channels may/will be misaligned with that particular time zone.
This is where additional chans2correct.xml comes in if we require it. Basically we just add specific channels that need time zone to be moved forward or back..
I have already tested chans2correct.xml and as awiouy has already stated an additional tvguide.xml will be created in Userdata/addon_data/service.webgrabplus. so....
guide.xml typically used on device Webgrab++ is running on and any other devices being transferred to with same time zone setting.
tvguide.xml for devices running in a different time zone and/or for any problematic channel.xml that webgrab++ has trouble automagically setting correct time zone
Hope these quick notes help others who want to try-out this preview release of webgrab++ and provide awiouy and the LibreELEC team feedback
[hr]
As for accessing http://guide.xml/tvguide.xml from the Kodi GUI:
They should be accessible from the Kodi GUI via: Profile directory, addon_data, service.webgrabplus.
Default xml file locations should therefore be fine for local use and polling the guide(s).
As for guide storage location:
I will consider this later, if I am able to control xmltv_time_correct.
Incidentally, I do not intend to program code to edit the xml configuration files.
As for start time and period:
Unfortunately, the current implementation is the only one I am confortable with.
Fortunately, it provides for both users who run LE continuously and users who switch LE off when they do not use it.
I will let someone more experienced than me find another solution.
Nevertheless, increasing the period is trivial (is a day ok?), and adding a start now button (ie to trigger webgrabplus.start from the Kodi GUI) should be easy.
As for "F" and "i" updates:
How do you trigger "F" or "i" updates from the command line?
Thank you for your help!
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Accessing Guide from Kodi, forgot to ensure hidden files/folder visible in Kodi
(Many users could miss that, hence request to be able to set a user folder location in GUI settings)
Understand we don’t want to edit .xml files in Kodi, so easy to edit from a PC across the network to device running LibreELEC anyway.
Regarding run every six hours philosophy, actually on reflection and a few test runs its not that bad at all, assuming users typically set "i" in prepared .xml files for each channel
i = incremental i.e. Webgrab++ only updates changes, gaps, repairs and adds new shows (within specified time window to grab) since last run. If no guide.xml exists in expected folder, Webgrab++ creates a new one and then starts from scratch as if nothing had previously existed anyway. (user can delete guide if want a brand new clean guide creating)
I just not sure its a good idea fixing a time in code that all kodi LibreELEC users could then be hitting same webservices to provide data at similar/same time (just a thought really)
So around 30 mins for 1st guide creation (in my case) and then with automatic run every six hours It seems that guide updates are typically taking less than 10 mins for around 30 channels from more than one provider.
Thanks again 
)
and great news 
