Warning bleeps

Every so often when first switching on the ignition, I get a couple of warning sounds/bleeps however, nothing shows up on the dash etc to say there's either an issue or somethings not working correctly.
Anyone else get this and if so, what is it

I get it almost every time I start the car. No idea what causes it but there is nothing on the display, so I ignore it!

The only bleeps I tend to get on ignition on / start up are when the RSE controller gets powered to say its being charged, if you have the RSE chances are its this causing the bleeps, if not sorry I have no idea ??:

I think you will find it is part of the car's self check system.