Not recently, but our house is ~100 years old.

Be sure to get proper surveys done, and land searches. So both ensure you understand the structural state of the house, its condition, what may require improvements/repairs (and thus add to the costs). Ensure the survey has checked for signs of subsidence as foundation repairs are difficult and expensive.

More standard advice for any purchase is to ensure you know the neighbourhood. I don't just mean "good schools, good neighbours, transport links". Is there a waste treatment facility in the vicinity that you weren't aware of? Flood lines?

Good luck, it is exciting times!