You only need three cables.
On the Elite 24 if you wire just one cable to the left terminal.
Wire that wire into last tamper terminal in the PIR
take a short wire between 0V of the PIR and the first alarm terminal.
You will only need 1 wire to be good as you already have power to the PIR.
so try blue wire in last tamper terminal to left zone terminal in Elite 24.
then the other wires to see if one of them is any good.
Thanks for your help with this but it looks like I am screwed with the cables. I can't get one to work without tamper despite trying.
I have decide to cut my losses and go with the Ricochet setup for the one sensor. I feel fairly confident I will be able to get it installed and working with a little guidance.
I have purchased a GCD-0001 and a GDB-001 as shown, is there anything else required to get this setup?
Many thanks,
Simon