In article ,
ne says...
I found some old iron pipes that had been left rolling on my dining
room ceiling by a previous plumber. They are far too long to get out
without cutting them or taking up all the floorboards.

I have tried a metal cutting blade on my jigsaw but progress is
*extremely* slow - the pipes are thick walled and very hard.

If they're really hard they might break if you whack them with a lump
hammer (or a cold chisel if there isn't hammer access).