Beep on start up

[Andymcd82]

Hello everyone, PLEASE:

Could anyone help or advise on a issue Iv got on the car. First time starting the car I turn the ignition on and get all the normal light on dash, I then turn the key and just before the engine starts I get a beep coming from the engine bay. Runs like normal and starts just fine second time round . Never had this before and only started doing it a couple of days ago.
Thank you.

(The bold bits were added later by someone with manners)

 

[White16valver]

Is there a beep associated with the change-up light at the rev limiter?

 

[MonkeyKnifeFight]

The throttle body makes an odd noise I suspect it’s that.

 

[Louis]

They all do it. Just ignition on and open the bonnet