2 wc's, 1 waste pipe?

[noodle]

Could anyone tell me if it's possible to have 2 WC's, back to back either side of a partition wall, running from a single waste pipe into the stack.

I want to build an en-suite adjacent to the existing bathroom, and wondered if I needed 2 waste pipes from the soil stack or if I can use the existing WC waste pipe and attach the new WC to this.

All help appreciated! Thanks.

[plumbbob]

http://www.diydoctor.org.uk/forums/view ... hp?t=11746