the bravo uses a negatively switched system (which is default on microscans)
behind the glovebox there is a yellow relay, this is the central locking relay. you can fit remote central locking easily if you solder the wires onto the appropriate pins on the relay, and then refit the relay (easier than it sounds).
which wires go on which pins?
i cant remember, its over a year since i last fitted one on a bravo.
however on your remote locking kit you should have 1 wire for locking (usually green on a microscan) and one for unlocking (usually purple on microscan), each of those wires will need to be connected to the pins that are where the earth signal is received by the relay. [!!not the pins for the locking motor power as this can damage your RCL kit]
luckily there is also a good permanent live behind the glovebox, the glovebox light is a permanent live suitable for powering your RCL kit.