I've just had some work done on the same vehicle as yours
Its one press to super lock the vehicle, however if your internal latches are not fully flush once locked then there is a problem with the locking mechanism
On mine, i would press once and OSR and OSF doors would only go half way, not fully flush, thus i could open the rear door from outside, even tho i'd pressed superlock, and these could be opened from inside.
Its a cheap job at LR garage, an hours labour plus 70 quid for parts.
Now its one click n fully locked