As for the wiring and fuses, this might help?
4 fuse box on the bulkhead:
1 1-2 35amp Brake Lights, Reverse Lights, Direction Indicators & Rear Screen Demister.
2 3-4 25amp Horn, Headlamp Flasher, Brake Failure Circuit & Radio
Memory.
3 5-6 25amp Heated Blower Motor, Windscreen Wipers, Washer Motor & Instruments.
4 7-8 15amp Side & Tail Lights, Panel Lights & Instruments.
1-2 These circuits only operate with the ignition switch at position "II".
5-6 These circuits only operate with the ignition swithc at position "I" or "II".
I compared the above with my own handbook relating to my 1990 mainstream Rover Mini Cooper 1.3 and the latest Haynes manual which covers all Mini models and the only thing I could find confusion with was in the Haynes
manual it states that on later models fitted with the 4 fuse box (probably injection models) both 1-2 & 7-8 circuits operate the headlight dim-dip
relay, surely a mistake?
Ok now the 4 In-Line Fuses, luckily the wire colours are highlighted in my own manual (they aren't in the Haynes) and they should also relate to yours too? But I doubt you'd have the 15amp - Blue/Red Wire for the Auxiliary Cooling Fan as that only got fitted to Mini Coopers and all models from 1992 onwards?
15amp - Purple/Orange Wire Hazard Warning & Interior Lamps
15amp - Brown/Orange Wire Dim-Dip Lighting
10amp - Blue/Orange Wire Rear Fog Guard Lamps
15amp - Blue/Red Wire Auxiliary Cooling Fan (If fitted)
Hope that helps.
Taffy