Nah! Who's in charge of the park brake lever? I had to be quite firm with some ground crew who wanted me to release the park break just to get that message sent. I told them we are not clear to push, the park break is set and we're not moving until clear to do so. The delay is down to a SLOT! You understand? Reply "then that's your delay!".. Umm! NO. I don't give a stuff!