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Chris, we know the offending bush, a Privet that is going to be removed today and I'll plant flowers there. Should be safe with them. 
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I hate to be bearer of bad news, but once the tree roots are in the sewer whether or not you remove the tree they'll continue to grow in the pipes. If you can, I would reccomend digging down to the problem area and repairing the broken/damaged section. Very easy to replace a section with things like rubber couplings etc.
With the internet and digital cameras I eckon I could help you out from my comfy chair
If not definately keep checking the offending tree roots in the sewer and control the growth.
Cheers Brad