I have to say that I have been somewhat amused by some of the posts on this thread. As far as I know all modern cars with central locking allow for the doors to be opened from the inside when locked outside. I would guess that it may well part of the construction and use reg's that this is the case to allow people to get out of the car in the case of an emergency. Certainly both our tintops work this way.
My Plus Four locks both doors on one press of the button on the remote. Both doors can be opened from the inside. There is no "double blip".
Both doors unlock on one press too.
The key locks both doors and both can then be opened from the inside. However if you unlock with the key the driver's door unlocks whilst the passenger door remains locked.
