Indus,
The post #13 that you refer to in your post #19 seems to have vanished.
The gist of the post was that the user name had spotted an imaginary interceptor trap where none existed.
The writer locates his interceptor trap high 30" to 33" above the main drainage invert in a redundant pipe that might actually be a vent pipe.
He located his imaginary interceptor trap on the inlet side of a manhole - very unusual.
The only interceptor trap in your manhole appears in your last pic - it can be seen in the channel outlet from your manhole where they are often located.
Presumably the cctv camera saw no blind junctions in the run from " what appears....trap" towards the house. You presume much and imagine a lot. The green algae could be alien spawn ?Pics 3 & 4 show blockwork subsiding upper left and upper right of the manhole:
The RH subsidence is above the "redundant" pipe.
T
The LH side subsidence?
Presumably its a collapsed drainage pipe.
How come that there's no mention in the report of this pipe or the damaged pavers above the pipe?
OP, What is the cause of the green tracking of algae to the right of the man hole?
OP, do you have a drainage map and a copy of Auger's video?
It's going to be quite a few thousand £s to fix.
The sunken blocks are a simple fix which you could do yourself if you are able, for a few hundred pounds at most. You'll spend more money and effort if you start getting independent surveys done and chasing the insurance company.
There are a number of good guys on here who could advise if required.
The block will have to be lifted to relay, make sure whoever takes them up removes any broken/redundant vent pipe first, before making good the substrate and relaying the paviours. Hole into manhole can be carefully plugged with a stiff bit of concrete, ensuring any that falls into the chamber below is removed.
.Indus,
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