Hi Brad, thanks for the advice, according to the plumber it's only about 30 to 40 cm down on a junction so once I dig out the roots I may be close enough to replace the infiltrated section.
All the pipes are plastic and not the terracotta type so I think that's a plus for starters.
Internet plumbing
, hmm could be the start of a new business venture, it would certainly be a lot cleaner.
Cheers