Sorry not to get back, microcat. I can't find the notes and photos, but drop the insulation panel under the dash and I seem to remember the unit is clipped in on the right hand side. The connector to it has a load of wires on it, but there are a red and a yellow wire right next to each other. There's another red wire too, I seem to remember, but these are next to each other on the connector. One wire is for "open" and one for "close". I think they need to be grounded to operate.
On my Cobra alarm, the orange wire went to the red at the control unit and the violet wire to the yellow. Then I connected the supplies to ground.
Depending on how sophisticated your alarm is, perhaps needing a speed signal, etc., I do have all that written down if only I can find it.
For the central locking, I must admit I cheated and looked at the wiring for my other CSE, which as luck would have it, also had a Cobra alarm and the wiring colours were the same even though the alarm was about 8 years older.