I was given a sample of Diaxtol by Barry Thornton but the results were appalling and I followed the instructions to the letter. I know of other photographers who had the same experience. However and in fairness I have spoken to photographers who swear by it.
I'm getting lots of good and encouraging replies in this forum and it seems as though PMK is coming out tops. I'll give it a try when I get the chemistry. Thanks for the tip about Ed's web site.