wow thanks for all your replies. i knew this could be an issue, but, as one of the posters said if we are told to just reduce to min app speed, and not allocated a speed, then i was thinking that the airbus mini function could cause an issue. from the replies, i gather that this could cause problems but atc been on top of the situation would see us catching up or causing a flow problem. just trying to see the side of the controller as i hate mucking there job up, its tough enough whithout us maybe not understanding the problems this may cause. i know 3tcas and alike can help us see our closer rate and either slow ourselves or mention it, but would using this info just increase your problems on top of the ground speed mini function, i.e. we slow using selected speed then manage the speed back to ground speed mini, i guess then this buggers up the aircraft behind if we do this.
cheers