Hi guys. Just to close this one out.....In the end (as others had suggested) I ran a new wire piggy backed from the opposite side taillight - and routed it through the spare wheel space etc....and 'touch wood' has sorted the problem for now.(Fingers crossed). But thanks for everyone's suggestions. Current Vehicles:
2007 Freelander 2 - XS Tabora Flame TD4
1989 Range-Rover Vogue SE V8 3.9 Petrol/LPG
1976 Land-Rover SIII SWB 88 County, 2.25l Petrol/LPG
Past vehicles:
1999 Range-Rover P38 V8 4.0 - Money pit
1988 Range-Rover V8 3.9