Thanks for all the love guys. At fullscreen on my 27" monitor (print size about 13x16") it's just starting to look a little 'unsharp', at 50% on 2400dpi it's really bad (but then, I'm not ever going to print it 8x10m). It's that damned Betax shutter missing a spring, the only speeds that work are B, T, and 1/50. I think this was one that I double-tapped 1/50s to get 1/25s, there are two distinct exposures up close. At least it's a press shutter, but as you all saw that tripod wasn't up to the task (next time I'll have my new Abeo).
Still, perfectly good for a contact (meanwhile, I've just realised it's flipped left-right, based on how the other negs went into the scanner).
Did the other two sheets last night, of the Chimneypots. The wide one looks OK, but the close one is rather unsharp just on the neg, not sure if it's the tripod again, focussing error at 28", or just plain 100 year-old-lens-ain't-so-sharp. At least I've got the whole lot in 4x5 and 645 too...
As for C41, I tried a powder-pack of Unicolour (2-bath) from B+H last time I got a bunch of stuff, wasn't too impressed with the results (I do E6 Tetenal in my Jobo just fine so I'm disinclined to blame the process). I've got a pack of Tetenal E6 and Digibase C41 coming from macodirect.de sometime soon, with a few other chems and some RPX25 and IR400 4x5s, €201 worth was just under 10kg so only €59 shipping (above 10kg it was something like €90 shipping so I took some film out). If you buy a decent amount in bulk it's probably cheaper than Vanbar, plus from what I've read the Digibase C41 is a lot better than the Tetenal. Once it arrives I'll do all my Ektar and RVP from the Grampians.