Tried the Stop & Go kit on my car tyre (it was going to be changed today anyway), I drove in a No.8 screw, removed it, and set about the repair.
I may have overdone the reaming and made the hole a bit big (see later). If I need to use the kit again I will try the applicator with the bradawl spike as I use the reamer so I get a tighter fit, the rest was easy and there wasn't an air leak after I inflated the tyre.
I had a look at the repair when the tyre was off the rim and was pleased with the result, I managed to get my thumb nail under the plug and lever it out (hole too big ?) air pressure should have kept it in place but my trial run with the kit was worth it, maybe a run of rubber glue around the stem of the plug when pulling it up would have made it more secure.