So a surprise aspect was the builders saying
‘Don’t worry but due to the fact that there is an existing beam going across the old garage roof void, (which they were not aware of until removing the ceiling in the garage) and the upstairs wall being offset from the one below, we cannot quite support the floor above as we expected.
It should be fine but to be extra sure we are going to pin together the bedroom wall above with scaffold planks, we will need to drill holes through the wall to fix several big bolts to hold the planks each side of the wall together’.
‘Uh whaat!?’ was the reply
Pictures below show the upstairs bedrooms either side of the wall that was ‘pinned’ together temporarily.