I'm planning my new bathroom, and have problem with positioning the cistern on the back to wall wc. The existing connection to the soil pipe is from the front of the soil pipe to the back of the existing pan, and the cistern sits in front of soil pipe. What I'd like to do is have the pan sit in front of the soil pipe as now, but position the cistern (which will be hidden in a unit) off to the left. Is there a way of extending the pipe providing the water from the cistern to flush the loo ?