Many thanks to Lionel and Mike for organising the new socket to connect the booster batteries to the winch, much safer than jump leads.
We are however once again having problems with winch starting particularly first thing in the cold. It is possible that our operating system of switching off between launches takes more out of the batteries than the alternator can put back in. Could you all please run the winch for an extended period following a cold start, to enable the batteries to recover. I would suggest at least until after you have done the DI on the cables the winch doesnt use that much diesel when ticking over.