I see what you mean, nowno east not the little white blob ,to the right of it ,under the light coloured brick and at the end of the channel .
We re-paved the surrounding area, and left this manhole upaved, for access. The rest of the area is lawn. When we dismantled the original paving this was the only metal lid in the back garden and there is none in the front.Stick something sharp in the ground around that manhole, there could be another for foul. You would hear a dull thud when you hit the lid.
Or phone someone to CCTV down from your soil stack.
No. Could it be excess toilet paper stuck inside the toilet or soil from roof clay/debris entered the soil stack.are toilets on same side of house as the manhole?
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