I have solved the problem, I hope!
I have read read the instructions many times and disregarded the opening gambit "Two sail winches for the mainsail, one for port and one for starboard."
Fourth paragraph reads "Prepare both sail winches (one for foresail and one for jib), by fastening the sheet rope on the drum and wrapping it round twice. Also use the remote control to set the winches to completely lowered and insert the drum. Then pull the winch in and so wrap the sheet rope tight. Incorporate a small ring on the sheet rope. The port and starboard sheet ropes are placed on this ring."
I understand this to read 'One winch controls the jib, in and out, and one controls the foresail, in and out.'
All will be revealed on Wednesday when I propose to launch.