I have a Conlog alarm in my Anni and for over a year now the remote has stopped working, it's how I used to start the car as it bypassed the immobiliser. Now I have to put the fob into this slot:

This is very tiresome and annoying. I have changed the batteries to no avail.
Does anyone have any ideas on how I can either sort out a new fob or how to stop needing to use the fob to bypass the immobiliser through the above picture?
Thanking you.