As is well known, Vauxhall no longer stock the fitting kit for Signum Travel Assistant, so what to do with the TA you just spent good money on...?
The main components of the kit are the wiring and the metal bracket.
You will find that the base unit hooks onto the back of the seat and is secure enough just resting on the carpet. So the other issue is the wiring.
Run a couple of automotive wires (e.g. 15A, red and brown) from the boot to above the centre tunnel, passing them under panels as best as you can. Make sure you leave about 50cm extra in the car for ease of connection.
In the boot open the left side panel where fuses are, locate fuse 26 - this is the ignition power for TA.
Connect the red cable to the right hand side of this fuse - if you can't find a suitable connector then expose about 7mm of the wire, flatten the strands and push them into the right hand hole, place the fuse on top and push in.
Connect the brown wire to a good earth - you will find one inside the spare wheel compartment near the tail lights.
Now move inside the car and terminate the two wires with suitable round connectors - these must have insulating cover and will need to fit onto the pins of the base unit.
Counting from nearside, pin one is earth (brown) and pin 8 is power (red). Push the round connectors onto them.... and enjoy you TA.
No need to spend time and money for a fitting kit, nor do you need to cut the carpet. When you remove the TA just coil the wires and push them under the centre seat.