Thanks Martin,
Thanks for all the info, lots of help.
And brilliant news about the b+w, I have access to ID11 (which I believe is extremely similar to D-76, the same processing times) for free which will keep my costs down to just the film which I can get quite cheaply :) I also have some TMax developer which works great for trix photos so I may try that at some point.
Thanks for the tip of cutting it into smaller segments, hadn't thought of that. I'd just been having nightmares of getting 50 feet of film onto the spiral correctly and evenly in the dark, 10 feet or so per process seems much more manageable. Although wouldn't less film in the tank make the times quite different than a full roll, shorter times for less film? Maybe only 3 or so segments and then increase the time slightly when doing a full roll.
If its in segments I may just dump it in a normal empty tank as I quite like the sort of marks you get. Incidentally would this be alright for a whole roll? I have access to a proper super 8 tank, but would it be possible to just dump it all in a large empty tank, say one that holds 3 35mm photo neg, or would it all be pushed together too much?
Any ideas of rough times in comparison to b+w negative photos? A guess for me would be ID11 (pretty much the same as D-76) at 7mins, 9mins and 11mins or should I widen the tests? Although I guess I can see after the first 1 how much needs doing so I can work it out as I go along, maybe start at 9mins and work from there up or down.
Thanks