Try booting a Live CD/USB, mount your install partition and edit
$mount_point/etc/default/keyboard
Code:
# If you change any of the following variables and HAL and X are
# configured to use this file, then the changes will become visible to
# X only if HAL is restarted. In Debian you need to run
# /etc/init.d/hal restart
# The following variables describe your keyboard and can have the same
# values as the XkbModel, XkbLayout, XkbVariant and XkbOptions options
# in /etc/X11/xorg.conf.
XKBMODEL="logicd"
XKBLAYOUT="gb" # <<<<--- there it is, here: gb for british keyboard
XKBVARIANT="extd"
XKBOPTIONS="lv3:ralt_switch,compose:lwin,terminate:ctrl_alt_bksp"
# If you don't want to use the XKB layout on the console, you can
# specify an alternative keymap. Make sure it will be accessible
# before /usr is mounted.
# KMAP=/etc/console-setup/defkeymap.kmap.gz
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