I found these wireless winch remote kit on Ebay from a company called "Winch-It", they seem to have a collection of reasonably priced accessories.
The dual control wireless remote will enable both myself and James (the co-driver!) to operate the winch in a number of situations. Often the person outside the car has a better view of the winch situation so, although I already have dashboard switches fitted, this will give extra capability (and its a bit of a show off as well!)