Oxleyroad thanks for the D19 advice. I may try it if I decide PQ isn't right when I start on the Super 8. I'm interested in your note about sodium thiosulphate I added a similar amount to that suggested by the Ilford Reversal sheet. It wiped out the image by about 80%. So I rediced to 0.5g in 330ml and this improved but the image density was overall reduced by about 15%. Still thinking about that and went back to retest my original 1st/2nd times and mixes to check they were working correctly.