Hi Martin,
Yes, occasionally, you can get a deficient lamp in the dash, but certainly not 3 at once.
If the beeping starts as the revs rise, this suggests that you do indeed have a genuine engine fault. My advice remains the same as before - get to a dealer.
You don't necessarily need to have the work done there, but they can most accurately determine the cause of your warnings. You can then choose to have them repair your A2, or go to an independant dealer.
Cheers,
Mike