From my untrained eye I didn't see any issues with the roof or any obvious leakage to the inside. Tbh it's not in terrible condition just old , unloved and smells like dog.
But yeah again if something nasty cropped up on the survey I wouldn't be surprised and we may then have to back out/re-offer
Big house for the cash.thats a big roof and will cost a few Bob to replace - is it in good nick ?