During the recent freezing conditions, if your Megaflo tundish was full of water and leaking onto the floor, then the safety discharge pipe was probably frozen!
Dripping through this pipe indicates the system requires attention. It's normally a dry pipe, and dripping will occur if one of the safety valves is operating.
Once the pipe thaws, the dripping will continue, but discharge externally or to a safe location.
However, the source of the problem still needs addressing.