Ok it's been a little while regarding the Gedcom transfer from FH7 to TNG 13.1 .
I will try to highlight the steps that I carried out to try to achieve a smooth transfer. I am sure that what I list below is already known by certain FH7/TNG users, so I apologize for highlighting things that some users already know.
First of all I ran all the pretest checks on FH7 - Plugins UDF, Tools External files, Plugin Unlinked Media, Plugin Show Project statistics. I then ran the Plugin - Change Any Fact to convert Baptisms to Christening to fit in with TNG. I then ran Mike's excellent Plugin Export Gedcom File and selected the TNG options to include Source Template 1_SRCT (Remove Entirely), Source Type 1_TYPE (Remove Entirely). I initially selected the PART-LMO option for the transfer. Emptied the Export folder and then ran the Gedcom. Rerun the Plugin - Change Any Fact to convert Christenings back to Baptisms in FH7.
In TNG I accessed the Set Up - Configuration - Import Settings

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I then used a file transfer program to put the Gedcom file that was sitting in the Export folder into the Gedcom directory of TNG. I then used the Import Gedcom facility to import this (from website) Gedcom. There are a number of other options on this page to tick etc (see below).

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If you then come out of the Administration area on TNG and do a search on one of your Ancestors you should see all the information in chronological order and the sources BUT no media!
Then I FTP's (transferred) all of the media en masse to the 'photos' directory on TNG (You can also use the Upload option in the Admin - Media area of the TNG program instead of the FTP option.
I then went to the Admin - Media area of the TNG program. At the top of this page you have a number of options. (see below).

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On the search tab you will see all your media in the photo directory but not linked yet. So select the Thumbnail Option and select the Generate button. This will generate the thumbnail jpgs for all the media in the photos directory and when finished will give you a list of jpgs that have not transferred (too large, not there etc). You can the return to the Search area of the media, where all the Thumbnails linked to the Sources appear.
In the Admin - Media area, I then decided to set up new Collections to suit my directory structure on FH7 (I decided to create these directories through the file transfer program on my website rather than through the Collection option, matched up the Directory names and all went well) Individual Census, Marriages, Wills, Misdemeanors etc and I then en masse moved them from the photos directory to each new Collection that I had created, so after about half an hour I had just photos left in the photos directory. With the photos I then used the produce Album option and set up five or six albums for parts of my family and village photos etc. All of these new collections appear on the welcome screen for individuals who wish to view the website, plus the Albums are there as well.
A few idiosyncrasies I have found during this process. TNG prefers split sources, In the Rich text transferred an individual, place etc that has been linked in FH7 doesn't display correctly. It has made me revisit my whole file naming process for media files and as a result I have attached Keywords to all media via the lovely plugin written in FH7 (I can now easily find and select any media item that I need to move to my new collection in TNG.
Sometimes I had to reimport the Gedcom file in TNG to regenerate the links...and the last time I selected FULL-LMO option on the export and it produced all the thumbnail portraits which when put into the photos directory on TNG and followed by a Generate Thumbnail option in TNG, put all the portaits in their rightful place.
I would like to thank Mike and Sheepdip for their initial help and I would like to have attached a few more photos, but for some reason it stopped after Adding three files. If I come across any other items I will update.
All the best,
PP