I lost my only key recently and had to have a key cut by a mobile (and very expensive) auto key specialist. He produced the new key no problem but I noticed that on occasions when I go to start the car I get the message 'Security failed' and I have to try again and all works fine. It seems to happen if I wait for a few seconds for the glow plug light to go out before starting. The remote locking etc works fine. Anyone got any ideas why this is happening?