New soil pipe dilemma

[Oj01]

Hi,
Looking for a bit of advice on the best way to do things with a new soil pipe, apologies if its not complexity clear what im trying to do but i'll do my best to explain. The current layout is this:

I need to move the soil pipe to the side of the house for the new bathroom and for the new downstairs toilet. However to save cost I would like to reuse the existing sewer pipe. The issue is how best to connect the vertical soil pipe to the horizontal underground pipe, as i see it there are two options:

Or:

My concern is clogging where the vertical pipe meets the horizontal pipe from the downstairs toilet. What would people recommend?

 

[SimonG]

Get building control involved early as it will be down to them, no matter what anybody else recommends.

I just ask them now how they want it and follow there advise. Puts you in a good position as works progress.

 

[king of pipes]

The top one will be better keep away from the house to avoid the footings and any other services as above building control will need to pay you a visit . Cheers Kop