Ok I got the code the first time I tried it.  Failed to make the light flash the further 3 times I tried it though! 
  
It seemed to flash once, pause, flash once, pause, flash 4 times, pause, flash 7 times.  Or the 7 and 4 were maybe the other way! 
  
I'll have a scan on the net.  If anyone can shed light on this then I'd be grateful!