mine used to do the same sometimes it would go for weeks before it would blow another fuse.
If you look at the wiring that goes to the plug that is mounted on the compressor you may find that the wiring has been rubbing on the compressor housing and worn a very small hole through the insulation causing a short, move the wiring away from the comprssor and wrap it in tape.
While you have the bonnet up check the two hoses going from the compressor one of mine blew last week where the hose was rubbing on the engine mount and there is a hose that goes from the tappet cover to the inlet hose on the turbo check that isn't rubbing on the alloy pipe on top of the compressor.
disco seriesII mods so far:-bullbar,hyd winch,
detriot locker,lsd front,C.D.L kit,chipped and bigger intercooler,2" lift,rock sliders, lsd in transfer case, modified auto trans.
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