OK so I tried a Synth - although all the photos should Synth (barring 2 I left in by mistake) - some it couldn't match up and I couldn't find a way of editing the Synth to tell it where the orphans should go ....
So I deleted them from the list of photos to use and redid the Synth. The first one had 93% Synth - the orphanless one had 73% Synth?????
When I redo the Synth with all the original pictures I now get 90% synth??
HELP!! How do I get pictures that should all stitch together to produce 100% Synth :-(