i have a mk1 escort thats delocked , boot as well
got myself a £50 alarm , central locking system that operates on a 2 wires, ( cant remember which make , but most ford are 4 wire , ) and 2 relays
1 relay for each door and just a switch for the boot
i fitted all of the system and got an auto trician to wire up the relays
just hope the battery never goes flat