Just to give you flying types a little insight ....today I had a slot revised BACKWARDS three times as an aircraft was ready to start .I phoned Brussels flow and told them I was IGNORING their slot ...."you can't" she said in a nice dutch/croatian/english what the hell accent..what do you suggest I said? taxiway is blocked !! why should I take it in the neck for you? your call .....result slot BROUGHT FORWARD ....aircraft had to speed up !!!WE are as PI$$ED OFF as you .....I feel like a total gob$hite for telling you your slot has changed .......but blame the guys at eurocontrol ...NOT the guy on the ground at PMI ....or ...BFS!!! THERE! outed myself!!!!