Thanks Tony and Ashley. Ok, this is what I did.......the spoiler needs to be removed to access the the high third brake light. The spoiler is held on by two screws, one of the left and one on the right. The screws are accessed by removing each screw's rubber grommet on the inside of the tailgate and unscrewing the screws.
Once the spoiler is off (I just rested it on the wagon roof) then you can access the light (yes it is an LED strip light). At each end of the light there is a small red plastic tab which just unclips and provides access to the screw which attaches the light to the spoiler.
The two wires for the light go from for the light into a main wiring loom on the top right hand side of the tailgate. The wires were attached OK to the interior of the light, so no apparent loose connection. This is as far as I got as I could not see how to remove the red shroud from the base which contains the LEDs. I did not want to force it and break it. I will need to get someone to somehow check if the LEDs actually work or not. I tried jiggling the wires while the brake pedal was depressed, but no joy.
Tony, I don't think the XV20 wagon is rare as you mention. However, I searched for three months but never saw a Touring version of the XV20 wagon. It was just a fluke that this one happened to be a Touring model. So the Touring version may be rare.
I have a couple of W126 Mercedes cars, one a 300SE 4 door and the other a 380SEC saloon coupe. While I enjoy tooling around in the two Mercs, I do get a real buzz out of zipping along in the V6 wagon. It's another world and heaps of fun! Before getting the wagon, I would have a chat to the drivers of Camry taxi cabs and they just raved about the reliability etc of the Camrys. So I thought if the cab drivers drive Camrys en masse well that's good enough for me!
Cheers,
Kim