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Is this referring to the Part H bit about pipe misalignment, or something else?

I have started taking things apart now and excavating. Unfortunately I will need to break up the concrete surround of both the gully and the inspection chamber, and temporarily remove them, to have enough room to line up the core drill for the wall. As this is, I may decide to relocate the gully...

Cheers, hope the answers are in the same order as the questions!

I want to core drill through the cavity wall, underground, for a soil pipe. Due to the depth and location of the existing outside drains it will be very close to the footing, practically resting on it. It will need to be about a 150 mm opening. Is this a concern for structural stability? DIY-able?

Good to know, although I don't even think I could get even a normal 90 in series with the existing soil stack elbow - not enough fall. Forgot to take one earlier, but have updated my sketch (see previous post). Does this help?

The WC waste won't discharge above the open gully (lol). The gully is above the waste pipe. This cross section sketch might help. Edit: updated with better sketch. Underneath the gully is a 90deg elbow (confirmed( which I propose to replace with a swept tee (blue in sketch). The top invert...

Can the foul waste from a WC go on the same underground drain as an open gully? Basically the the gully would drain directly into the foul waste pipe? Hope the sketch below shows what I mean. Black is existing, blue is new. I can't send the WC drains to the SVP because there isnt enough fall...

Thanks for this explanation, but how would it be possible to rod the first drain (the branch from the WC, bolded above) from an inspection chamber downstream of the stack? Surely this would require the ability to 'steer' the drain rods up the 90 degree rest bend below the stack, then into the...

The soil vent pipe is inside tucked into a sort of alcove in the corner of the building and boxed in. The ground floor toilet is next to it and there is a short (less than a foot) connecting pipe that runs above ground , also boxed in at floor level. The toilet needs to be moved a couple of...

I'm a bit confused about how Section H1 covers ground floor toilet drains, specifically about clearance of blockages. I gather H1 is aimed at the drains downstream of the soil vent pipe, but assume similar requirements apply to ground floor (underground) laterals? Paragraph 2.46 begins with...