Thats going to be a hard fix and I think you are going to have to fix it with an inner patch first, but you must also make the hole round so that the split doesn't creep (Thanks Tonka, see I do Listen!) and you need to get a 10p piece and cut around it with a sharp blade, going no Closer to the seam. You also need to use the proper 2 part glue available from IBS.
do you have any patch material?
Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo