The shed is quite far from the house, right at the back of the property, so the roots are not a problem apart from getting in my way! lol We got a plumber to break up the concrete over the pipes that keep getting blocked up and apparently someone messed up when they replaced a pipe there some time ago. That is why we keep having issues. The whole thing is going to get replaced soon-soon.
They've had this house for 35 years, so the shed's been left to it's own devices for quite some time! (Which explains a whole lot…) He is delighted that I've taken it on and with the progress out there 
It seems no-one wants to cut it for me, even just to get it lower. The bottom half is too dangerous to cut into, with all the junk, so I said I'll settle for having the top removed at least. No go so far… When that is finally done I can work on the roof. I'm getting frustrated by the lack of progress now.
