If you don't want to hack the loom, what about the cigarette lighter feed? (I haven't looked at the D2 wiring but that wire is usually switched on Land Rovers.)

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Ron B.

1995 P38A Range Rover 4.6 V8 Auto; 1968 LR Series IIA trayback (Holden 202)
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ex-1995 Discovery 300Tdi auto; ex-1984 110 County V8 3.5 manual; ex-1986 Range Rover HiLine 4.6 auto; ex-1983 Range Rover 3.5 manual