In to the shed and put a light together, thankfully and to much of my wifes dismay I tend not to throw much away instead storing it there quoting "I might need that one day" well that day had come.
Power pack that was the easy bit, one of those combo units jump starter conpressor 12 volt outlet etc, heavy and bulky but it will do the job, work light off the bobcat wire it in and it works ,then to my suprise the worklight opted for early retirement, plan D spare car spot light from another part of the shed ,wired in and and away we go. Cows checked one cow calving all OK, woke up this morning feeling one arm is longer than the other, those power packs tend to get heavy after an hour. Bought a new torch today !!