ok, here's what I've learned, but please bear in mind I'm doing that stupid thing of developing colour film with B&W chemicals; I'm a cheapskate, ok - I'd rather buy dirt cheap film and mess about wasting a few until I get it right then start paying for good stuff and have fewer mistakes. So at the moment I've bought a major UK photography shop's own brand chemicals. They say they are ok for all film makes, so it's my presumtion that while each brand of film recommends it's own chemicals for profit reasons, they probably don't need them. (like Epson recommends Epson paper, but you can use any, yeah?) Secondly, regarding temperature; I am based in a semi-converted loft. Temperature up here varies considerably, and I have to admit I've done a couple of films at different times (and therefore probably different temperatures) for the same developing period with the same results - even though mine too say 20 C - I know for a fact I've been either side of that by a bit. Right, I'll shut up and let someone who knows what they are doing comment (when they stop holding their head and muttering 'No, Jordy, No......' and wondering how I got this far.... (",)