Do you know it needs rewiring? Fair enough if so, that is messy, and the current owners were daft to do so much decorating without rewiring first. But you can get an electrician to inspect and test it and do you a report for a modest fee. BTW, where the sockets are proves nothing in terms of if it needs rewiring.
Wall ties. What evidence is there that they're failing? Old houses (ours is 1920s and a similar type of build- brick and render) may well have a surveyor saying that wall ties may need checking. [Our surveyor said the same, given we had black ash mortar- but added that as the walls all seemed in perfect true and flat with not a crack in sight (even though the render clearly hadn't been painted for yonks) there was no evidence that there was a problem. I unearthed two during other work, and they were in perfect nick- and far and away chunkier than modern ones are.]
Render- a surveyor should go around tapping it, if it sounds hollow anywhere, it's detatched and needs patching. [Our surveyor found just one small detached bit a couple of feet square. I'll sort it when we put a new porch on, as that's where it is.]
Roof needs checking. So does every roof, in theory. What does it mean in this case? Roof from photo of front looks flat, ridge tiles straight, hip iron in place in the corner. I can't see any sags on that elevation from the angle of the photo. What was the particular concern(s), or were there actually any, beyond 'every roof needs looking at'?
Before you offer less on this one, you need to get the facts straight. If it turns out that there really isn't anything majorly wrong, they will tell you where to get off.