Dvorak, UK variant. Linux (Fedora)

I'm trying to figure out how to switch between a GB keyboard and a
dvorak layout.

I've got one method working.
I changed /usr/share/X11/xkb/symbols/us to 'tweak' the us dvorak layout
so I got the changes I want.

I'm told I can adjust /etc/X11/xorg.conf to have two variants

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "kbd"
	Option	    "XkbModel" "pc105"
	Option	    "XkbLayout" "gb,dvorak"
	Option      "XkbOptions"    "grp:alt_shift_toggle"
EndSection


which should (doesn't) let me change from my normal 'gb' keyboard
to dvorak variant in the gb symbols file.


It's not working and I'm told this is a more elegant way of doing it.

Can anyone tell me how the XkbLayout option picks the files it's using please?


TIA



-- 
Dave Pawson
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http://www.dpawson.co.uk