Save yourself the bother
There is a Landy specialist in Fajara, near the Safari Gardens Hotel, All the NGOs take their cars to him, he's usually pretty backed up and bloody expensive by Gambian standards.
I always thought that being a landrover mechanic was such a sensible career choice, It's a job for life.
Seriously though, if its just the bushings, take it to a back street guy, who will do just as good a job as the expat mechanic. Whoever you take it to watch them do the work or they might break 3 other things as they fix that one.