Drain beyond boundary that come back into boundary?

[Ian H]

I'm on a job where dye has proved yhat the drain serving the toilet is leaking into the cellar.

The SVP is in the neighbours garden so as far as I'm concerned it's Yorkshire Waters responsibility.

My boss is asking me to confirm that the drain doesn't come back into the customers garden.

Does that make a difference? I think as long as it starts off the boundary, it's not the customers responsibility.

The toilet is tiled in and the SVP is a very nice original cast iron one that I don't want to cut.

Thanks