Following on from http://sources.redhat.com/ml/cygwin-xfree/2004-03/msg00662.html
This is what the log says with XWin -xkblayout gb. Cheers, Jon === XFree86-Bigfont extension local-client optimization disabled due to lack of shared memory support in the kernel (--) Setting autorepeat to delay=250, rate=15 (--) winConfigKeyboard - Layout: "00000809" (00000809) (--) Using preset keyboard for "English (United Kingdom)" (809), type "4" (++) XKB: layout: "gb" Rules = "xfree86" Model = "pc105" Layout = "gb" Variant = "(null)" Options = "(null)" Couldn't load XKB keymap, falling back to pre-XKB keymap ===