Additional: I stumbled across TW-Graph5 here How to export/import a TiddlyMap?
With this plugin I have had a little more success, when I created tiddlers named say Susan Fred and Alison I can add links in each tiddlers text to some of the other tiddlers and see the group properly, however I am only seeing tiddlers that are directly linked to say fred[] so if Alison contains a link to Susan and Susan contains a link to Fred then setting Fred as the sole initial tiddler does pull in Susan but not Alison, I have yet to see anything that goes beyond first tier neigbours when it comes to following links but maybe I haven’t found the right setting yet.
I can certainly see cases where the use of filters like tags has introduced more tiddlers into the consideration but in terms of pulling in more than directly linked neighbours when links are the only connection to be followed I am not seeing it yet.
I am still interested to hear from anyone who has pondered a simple engine to identify linked neighbours out to a certain depth or zone? Something that starting with Fred will find nearest linked neighbour Susan and from Susan will find linked neighbour Alison and conclude that if the user preference value of zone depth is set to 2 then both Susan and Alison are considered neighbours but if the value of zone depth is set to 1 then only Susan is considered a neighbour. An engine that is basic and elemental taking in a target tiddler or list of tiddlers and delivering a result list of tiddlers etc.