Actually I was going to cross it above ground (with the stub directly on top of where pipe 1 currently ends). But I could now in theory remove pipe 2 if I needed to - it's been blocked & covered in paving for over 30 years
I'd remove pipe 2, it doesnt serve a purpose, but be very careful as not to disturb the junction where it joins the live drain. Be wise to seal it off with a decent lump of concrete whilst you have it exposed, it'll ensure rats dont decide to use it as an escape route at any point in the future.....
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