Hi

Currently building a new ground floor cloaks with WC and basin - drain
run is in, connected and approved by BCO - internally all there is is
the end of the 110mm pipe

I want to connect a WC and a basin to this pipe - what's the best way?
so far I'm considering
a) building a "mini internal stack" with durgo, using a branch "on
it's back" and connecting the basin on the vertical, finishing witha
durgo;
and b) plumbing WC straight to the existing 110mm pipe and "strapping"
on the basin waste direct to the 110mm with an anti-vac fitting to
preserve the basin trap...

Is either of these the best thing to do? or something else I haven't
thought of?

TIA

Jim