Rapid beeps/bongs on ignition

[klargon]

I've just taken ownership of a 2010 2.0 CDTI Astra J Elite.  Coming from and old Type-R, I'm a bit overwhelmed by the number of electronic assists!  I've ploughed through the manual and done some googling, but I'm struggling to find out if the beeps on ignition are normal.  Basically, when turning the key to the ignition 'on' point, I get a series of bongs in rapid succession, which stop after a few seconds.  After starting the engine, the status lights all disappear (except for the expected ones - handbrake, etc) but the bong sequence repeats again.  There's nothing reported on the screen.  Is this something I need to be concerned about?

Thanks in advance.