Saturday
I finally got around to fitting my NEC AD7173 DVD drive. I flashed it with the 1-2D firmware from Liggy and Dee and now it supports auto-bitsetting and is region-free. I tested it and a 16x DVD+R is now identified as a pressed DVD-ROM by the Xbox!
I went shoe shopping this morning, none of the stuff in the sales was work-dress, so ended up paying 32ukp for a pair that are OK.