It serves a sink in the downstairs toilet and the toilet itself
When we flush that water comes up that small gap at top of that black thing
There is no manhole in this garden. There is only another hopper directly to the right of this one which collect gutter water. The 2nd hooper is connected to the one I have an issue with.
By manhole do you mean a large grid possibly covered by a slab as this is in neighnours garden
Yep, not every house has one. The black thing in your picture looks like mud or a grease buildup. You have a blockage somewhere, it’s just choosing the least path of resistance (your gulley).
Not yet, I’d concentrate more on the blockage.
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