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- 8 May 2017
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now I have got the full picture !! the part marked blue looks like an access panel ,held on with 2 screws, and the seal has failed. still think its communal problem. if there was a blockage in the drain where this vertical soil pipe joins, at ground floor and you could not use your toilets ,do you think that would be your ground floor neighbours problem because they are nearer the floor and they should pay ? just curious. is the roof exclusively your problem as you are nearest ?