In reply to Fingal10:
I've had some luck with Altberg Mallerstangs in a medium fitting (B1). I have narrow heels and a wideish forefoot. I found that on trying the boot it slipped a little, but after a couple of wears they formed to my heels and gripped. 800km and no blisters!
It is difficult; from experience it is impossible to tell if the heel will fit until after the boot has been worn a couple of times on the hill. An potentially expensive and painful process!
I also had some success with a pair of Mamut b0 boots (Mountain guide gtx?), but they required the heel to be 'adjusted' by heat. I am informed you cannot do this to a b1 boot or stiffer.
If anyone has any other suggested boots (leather b0, b1, b2) I would be interested too!
Post edited at 20:24