When toilet is flushed, overflow pipe outside leaks, how do I fix this?

[JG1965]

When our toilet is flushed the overflow pipe outside leaks water as we have been noticing a puddle on the back door step, why is this and how do I fix it?
Thanks in advance.

[SOTERIOS]

Doe it leak before or after flushing?

[boxtops]

Perhaps the ballcock in your cistern needs adjusting, it might not be stopping the flow of water as it should, leading to the water level overflowing through the outlet pipe.

[Khandro]

The cistern, which is the box to which the flush handle is attached has a lid, simply lift it off and have alook what is happening when you flush it. The ballcock - the floating ball- is on arm which has a screw at its neck, tighten this slightly and it will prevent the ball from rising too high and your problem will be over.