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Bit late I'm afraid, but if your works van was one of these new fangled euro types, the live lead is BLACK :ohmy: and the earth lead is BROWN :silly:
Always best to join the engine blocks with the earth lead, then try and join just the two lives with the second jump lead, a big flash and pieces blown out of the jump lead jaws means you are trying to join a live to an earth, but it doesn't fry anything.
If it suddenly breaks, go back to the last thing that you did before it broke and start looking there