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If it's a solid wall house, I'd be walking away - unless you fancy stripping the render & starting again.
Seems a bit extreme. Cracks in render can be ground out and patch repaired. If there was no evidence of the whole lot blowing and coming away and no evidence of it causing other issues like damp, I wouldn't let it scare me off. I would be mindful of it though and try to get a discount on the house price based on multiples of the cost of repair.
Show me one rendered wall in England that has no cracks etc...
The cracks are failed render, which could mean damp problems.
I'm not a surveyor / structural engineer, but as I understand it, they're the wrong direction for subsidence.
If it's a solid wall house, I'd be walking away - unless you fancy stripping the render & starting again.