Aye he joins it to the car. I just got a standard iso block adapter, chopped of the ends and merged the radio loom to the iso loom and all was good. Means none permanent and fully removable.
https://rover.ebay.com/rover/0/0/0?m...2F180731095273
The a pillar trim just pulls off. And the multichanger wiring is just two leads for power and sound its not in that loom.