help, I share a waste water pipe with the downstairs flat ,it goes from my kitchen and down through our hall wall and into their bathroom. I have lived here 9 years with no problems ,recently the newish neighbors have comlained of water coming up through their bath and not draining properly. on investigation this water seemed to smell like washer water so i offered to move my washer incase it was the problem. This didnt seem to be the case, anyhow the neighbors landlord has ignorantly just disconnected my waste pipe from his and blocked it off. this appears to be the only outlet practical for my kitchen sink waste as it runs under the house to the alley at the side of the building which is a busy public footpath .Can he do that ? ,i believe the blockage was not my fault, either way dynorod should have been called first ,but their crooked landlord doesnt comunicate ,he does what he pleases,iam at my wits end please help.yours faithfully ...geoff H