Boundary construction on neighboring property - Consent declaration

3m excavation depth => 0.60-0.80m working space + 1.75-3.00m slope depending on soil conditions, so roughly 2.40-3.80m intrusion into own property

It has already been established that this is not mentioned anywhere and that shoring is certainly planned.

Well, we don't know, and the OP probably doesn't either so far. I would refrain from speculation until he reports on the outcome of the inspection.

Not at all. Because if a retaining structure is planned, you do not need to use the neighboring property at all, unless you need a tied-back retaining structure.

Not at all.
Because if a shoring is planned, you don’t need to claim the neighboring property at all, unless you need a anchored shoring.

Or you simply want to drive over there with an excavator and store the soil that will be backfilled in between, because transporting it away and back would be a considerable additional burden...

First, let someone explain exactly what is going to be done. A general “they are not allowed to do anything!!!1!!!!11” can backfire.

Yes, it says there that he wants to store earth there... but sure, the OP has to report it first.

Tonight is the inspection, I will report.