Rear body harness with speaker wires,known as thin wall PVC type type which replaced the thick wall type in 1989.
AN166 is the thick wall early equivalent.
If your car has no speakers just disregard the extra wires. This loom has bullet terminals for the roof lamp but Rover added wires with spade terminals to fit the interior lamp.
All rear body looms are OBSOLETE from Rover but we can get them made up from samples or the following definitions. From 1985 all cars had rear lamps with reverse lamps and one fog lamp fitted either on right or left---all had interior light in the headlining, rear heated screen, petrol tank gauge---
Changes were--washer bottle moved from engine bay to boot 1991, Fuel injected cars need extra wires to fuel tank for pump--speaker under rear parcel shelf replaced by speakers on top of rear parcel shelf---alarm swith