Thanks for that simon, am now wondering if its the fob, when i got my keys out of my bag yesterday the button was pressed in and under a bit and i could see the board inside, so seems unlikely by the sound of it that its all in contact, so will take a look. Im in Surrey :)

Hi Ive just discovered this forum in a desperate attempt to find out what to do about immobiliser. I recently replaced my disco for another which has central locking and immobiliser (never had this before) I have very limited mechanical knowledge but need and love my landy as I have horses...