Location of headlight range controller

[milespd]

Hi, on my Mk 1 Superb Elegance I've had a lights failure message come up on the maxidot display every time I start the car for a while. While the car was with the mechanic yesterday he ran the diagnostics which gave a 55 Level Control Xenon Lights error number 65535 - checksum error - ECU defective. After he discovered this I checked that the headlight adjusting motors did their little dance when the engine is started and - surprise - they didn't move. I am getting a second-hand controller off eBay but does anyone know exactly where the controller is located? The manual says left side of boot but it isn't obvious. Do I need to remove all the boot trim to find it?