In article , "lagerboy69"
says...

Does anyone know of a good method to cut into an existing soil pipe in a
boxing as I cannot find any saw to fit in the space to cut it. only a
hacksaw blade on its own in my hand works at the moment but this takes
ages. any good ways of cutting into it while its in position??

Someone pointed out a few weeks ago that if you cut a window in the
front with a small angle grinder

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then you can cut the rest from the inside.