cast iron downpipe

Hi, I've got a cast iron downpipe which has a section with an access hatch. The bolts on the hatch door have been corroded over time and have broken off, so it leaks quite a bit in the rain. I've tied it back on for the moment with some string, but looking for a better fix without having to...

I want to install a Water butt by our downpipe. It's 68mm cast iron all the way to to the roof and I have PVC pipe to replace the bottom 2m or so. I'm cautious about cutting the pipe to install a rain water diverter because I don't know how much weight the two brackets below the cut (close to...