Yup. Over 4m needs some method of securing the ladder at the base.
Upto 9m is legal though with that condition.
Climbing from a ladder at 9m over a balcony is certainly
not. And climbing back onto the ladder with no fall arrest stuff certainly is definately a big
NOT.
In terms of risk, balconies are not meant to be climbed over. They are meant to stop people falling.
Having said that, leg over balconies - we've all done that. :
.. but in terms of the law....
Cheers