I’ve only scan-read this thread but if the full survey was supposed to be structural, why was it done by
rather than a structural engineer?
Equally, without seeing a photo it’s very hard to judge, but lintels over small openings are very rare on pre war buildings. Arching action (not nec in the shape of an arch) was used and the steel strap is very common on flat arches. Which leads me to copy this from waswas:
They can’t put every construction technique used in the past in their report – if it looked ‘ok’ (ie. no external signs of a problem) then, tbh, it woudl probably have lasted another 50 years inany event.
it’s only when people start hacking about with stuff that the problems start.