UK MATS Part 1
That's an interesting one. It would suggest ATC is responsible for separation on takeoff. Years ago I was at LGW, holding. An M was given "cleared for takeoff" behind an H. The captain of M spouted up that "You should know I need 2 mins!" Humph. ATC replied, "I only cleared you for takeoff, I didn't order you to takeoff. Take your time."
So which is it? I'd always assumed it was the pilots' responsibility on takeoff and ATC on arrival.