Ordered some. Very accomodating chap on the phone. Got some thicker-cored 12, 15, 20, 32, 42, 55 to replace, but hopefully give the same tension as my 12, 15, 20, 36, 48, 64 (though I said 62 cos I just changed to 64, but hopefully its in the ball park and if it all shows promise I can refine my next order).