Hi,
I think it is a rear body loom from an early Range Rover. The purple wires will be for an interior light, the grey wiper motor plug for the rear wiper (Range Rovers used the some wiper system on the rear wipers as Series 3 Land Rover front wipers), and the heavy white/black cables for heated rear window. Other wires will be the feed to rear lights. I can't identify the part number as the RR Parts Manual just shows NLS (no longer supplied) - later models are part numbers PRC1105 and PRC3050.