Hi Rob,
We use Spinnaker seam tape. It is about 8mm wide, double sided, sticky as hell and we just lay it in lines across a piece of polyester rip stop to make it sticky, then rip off the backing tape and stick it to the repair. Make sure it is 1" larger than the tear in all directions and make the edges rounded so it wont peel. This usually works a treat.
You can also just sew on the stickyback insignia tape. Leave any repair in the sun to allow the glue to soften and then press the patch down with the back of a spoon on a smooth surface until the glue completely perforates the cloth.
Hope this helps.