Thanks for the info, I had a size 4 standard gauge Korda Krank open up on me on Sunday, gutted because it felt like a good fish.
I was using 15mm pop ups. I've got some size 2 wide gapes at home and some 14mm pop ups, these are more buoyant than the 15's I was using.
If 2's are ok i'll order some Korda basics Krank X's today as I prefer this patten.