Hi Stuart, To find the immobiliser box, Remove the column covers, Follow the wire from the Transponder reciever (around the ignition barrel), It goes under the dash, It's about 3" square and 1" deep, It only has 2 plugs in it, One plug goes to the transponder reciever,the other one has the feed and signal wires in it, They are fairly easy to get to, (The cable from the reciever is only about a foot long, so it can't be far away). Usually straight above the drivers feet. If you get the part numbers, Gibe me a ring on 01226-299906 or post them on here, Or if you don't want to get involved with it, send it over here. ??