Just wanted to thank anyone who might have replied and let those who have a similar problem know what I did.  My alarm was not set. When I put my 4-digit code in to stop the bell sounding initially, I used the code for stopping the alarm.   What I should have done was put in the code + A LETTER (for the zone), which was the code for SETTING the alarm.   Then I could put the code for stopping the alarm, which is what I have now just done.   Initially the alarm was not primed at all - and I put the code in for stopping it -( instead of the code for starting it ) and it didnt work. Its taken me 5 hours of searching forums when it occurred to me.  It all makes sense now but at 0400 hrs, I could not think straight.   Thanks anyway.
                 Anne
                
 June 2014