The main loom will already be in your car. If you have a look under the steering wheel just up and under the lip of the dash board you'll find/see/feel a multiplug connector. Now obviously this won't connect to your boot release wiring, because you need the loom which connects to this plug, and runs along your dash to each door. This is for the central locking and electric windows, but in the middle of the loom is a connector for the boot release (along with a stereo connector).
You can go to a scrapyard and fish one out of a Fiesta with electrics. Just bring a couple of screwdrivers as the plugs that fit into the doors from the car can be a pain to remove if they're stuck on with crap
