i had a bath fitted before and he said i needed all my lead piping changing, which he changed. now i have noticed a leak from my overflow pipe. i know i need to sort my ballcock out in the loft too , but how easy is it to change the overflow pipe? it needs changing as i can clearly see that it looks like it has been hit with a hammer and chisel and is dripping underneath. i have tried putting some of that duck tape round it, but it just keeps coming through. do i have to actually change the pipe or can it be mended?