Ben's post describes the position of the current jib jammer on the Ambulance, sadly the fitting that is installed there does not work as the crew or helm can't pull it on when away from the center of the boat? Replacing the fitting on the Ambulance with one that works/rotates would be the quickest fix. I think Riot has her jib in this same place on a turret.
EJ's jib is on the floor by the case and uses one of the large Allen swivel jammers, but the fitting is £50.
Another alternative for zero money for now would be to use one of the spare control lines that are lead up to the sides. A continuous system here could be easily accessed on each side, but personally I prefer to be able to adjust the jib whilst on the wire.
I think the one on Strawbs was a good place if the kicker is arranged so that it does not get in the way.