So, armed with McNett Tenacious tape, McNett Seal Grip, McNett Sil Net, Exped fabric glue and some Hilleberg silicone coated flysheet offcuts I have been doing some tests.
McNett Tenacious tape sticks but peels off rather easily.
McNett Seam Grip just rubs off when dry.
Exped fabric glue and a Hilleberg silicone nylon patch just peels off when dry.
McNett Sil Net does the job. A small blob spread out around the small hole and left for a few hours dries and adheres. Flip fabric, do the same on the inside.
Repair's a good un!