Turned out 11's preview was on a UK DVD, so that's dealt with. 12's done too. On to 13... 15-16 won't have previews since they never aired dubbed outside of au/nz where the previews were not shown, and I don't cut previews together well. :/
After 17 I may wind up skipping ahead as there is currently no usable rip of certain eps, including 18, on account of every version being sourced from the same broken mpegs.