My landrover 3.9 refused to start today after a good run

. After several attemps to start i figured it was ignition related as it did,nt even try to fire, i gave up & called the RAC. The guy turned up & within minutes of my diagnosis found the culprit. The 12v feed to the coil had given up & a replacement feed was added via the side light socket. Now my question is where is the 12v coil power fed from as i,ve scratched my head looking at the manual

. Any help appreciated.