hmmm what genuine reason would they have for checking your drains??
I used to work for a civil engineering consultancy and we had to check people's drains for water infiltration so we could design the waste water networks properly. However if you're on an existing mains system i can't see why they'd need to come and check it.
ususally a blocked up ****-pipe is the land owners responsibility, and the utilities companies wouldn't be interested in your connection.
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