Ok I have solved this - adding the lcd_redirect command to any init or rc.local script etc doesn't work because it is loaded before the LMCE orbiter.
Heres what I did to get it running -
Make a deamon
sudo nano /usr/sbin/lcd
#check if the OrbiterGL is already running!
if [ ! -z $LMCE ] ; then
while true ; do
/usr/local/sbin/LCDd -c /home/linuxmce/lcdproc/LCDd.conf
change the lcdproc and lcd_redirect paths to suit you
Then make it executable
chmod 755 /usr/sbin/lcd
And make an init script
sudo nano /etc/init.d/lcd
update-rc.d lcd defaults
The lcd_redirect will then start with the orbiter. You can have the mythtv lcd client set up to display tv info (when you quit mythtv lcd_redirect will start back up)