Reader-added tags include "The price of a life", "Life is not cheap", and "Full harness".

Good news is if the tool set from the previous page and this safety line is enough to repair the roof, that still puts the cost way below the initial 400k-600k from hiring a specialist.
Then again we haven't seen how expensive the roof tiles are.

Bearing in mind an interest, in that I fell from a [ carpenter fixed ] loft ladder a few years ago, and smashed my good right arm: scaffolding would be best. My fastened ladder swung from under me, but rungs can buckle, lines can break and anything that can go wrong may do so.

Re the slating in the last but one column I looked up slates again, and came across this elderly --- and somewhat erroneous --- thread:

There was an older mason in town last week about two blocks from our house finishing some chimney repointing. He hosed down his brickwork and unfortunately must have forgotten that it was a slate roof. One step onto the wet slate and he fell 40 feet to a bluestone patio. He died shortly after arriving at the ER.

https://www.finehomebuilding.com/forum/how-long-does-a-slate-roof-last
.

I now feel more German than American on Health & Safety in the workplace...