The panel has 8 zones has built in ethernet for web access and apps etc
https://www.securitywarehouse.co.uk/catalog/siemens-spc4320320-kit-grade-2-p-3695.html
Voltek
external PIR
https://www.securitywarehouse.co.uk/catalog/voltek-single-head-external-sensor-1804-p-1529.html
single zone controller (add as required)
https://www.securitywarehouse.co.uk/catalog/voltek-single-zone-control-unit-1803-p-1535.html
command centre if needed
https://www.securitywarehouse.co.uk/catalog/voltek-tzx-command-centre-1819-p-1539.html
GJD
PIR
https://www.securitywarehouse.co.uk/catalog/gjd-mini-opal-external-pir-p-1959.html
switcher
https://www.securitywarehouse.co.uk/catalog/gjd-gjd040-4-zone-expansion-unit-p-2119.html
controller
https://www.securitywarehouse.co.uk/catalog/gjd-dygizone-digital-4-zone-lighting-controller-in-white-p-2674.html