There are 2 types of BCU , one is Lucas ( Square Fob ) and Pectron ( Oval Fob ) . They are both located in the same place . If you remove the footwell panel where the interior lights are , you will see it below the radio , tucked behind the heater controls . It is held in place by Torx screws at either side and you will need a Torx + bit to remove them .
Hope this helps .
John