Hi, we currently have a 70's style bathroom with the sink under the window and toilet on the main wall. We are looking to replace the suite and wondered whether we should swap the sink and toilet around. The waste pipes run back to the main rising soil pipe in the corner of the room and we would need to swap the waste pipes around that join this. We would just like to ask those that know whether this is a big, expensive job or whether it is a failry straghtforward plumbing job (for the professionals not us!). Many thanks