According to the wiring diagrams it is fuse LF5 (15 Amp), Auxiliary Cooling Fan Relay. This is the one I had to repair on my car. I has nothing to do with your LF14 (15 Amp, purple/purple) for the driving lights. However, if you have two spot/driving lights and two fog lights independently operated then the wiring diagram are messy. The only Rover ones I have seen is for the Japanese Mini and they are wired differently.
It seems that your main problem is in the fuse box area for fuse 3-4.