Our car developed the 2 beeps when Unlocking after my daughter had borrowed the car and kept locking the car more than once as couldn't remember if it was locked.
Sat inside and tried the double lock and the alarm didn't set i.e. I could still open the doors from inside

Tried the method of removing volumetric alarm module and re-plugging the green (had my doubts)

Worked and can now set double alarm and beeps have gone when unlocking

Cheers to all that have posted this fix
Pejo