High level brake light was working intermittently and then off altogether, fault broken wire inside rubber tube were the wiring loom passes into the tailgate (top left). Fix- pull out rubber tube to expose wiring loom and remove tape to find broken wire (use multi meter if you own one), pull broken wire ends out of tube and push in a length of twin core cable twice or three times the length of rubber tube. Solder each broken end to one half of the twin core cable (other cable wire is left for a spare) tape up soldered connections and tuck into bodywork holes, refit rubber tube gaiter.