My elderly mother lives in a semi detached bungalow and has lived there for 40+ years, the neighbour who moved in 4-5 years ago has done numerous improvements to his house. his recent large paved area at front of house slopes towards my mothers, there is no edge on the paving and no drainage, consequently all rainwater drains onto her garden. Also downpipes from his bay window and roof also lead water to her garden and not into any drain. The old fashioned drain leading water from her down pipe through a gulley to the pavement in front of the house cannot cope with the water. as a result the garden is constantly boggy and flooded during rain and has caused all of her shrubs etc. to die. Is he legally obliged to put a drain in on his land. He has persuaded her to fit a soakaway drain at her expense as he feels he is not at fault. this would be a big and expensive job.