Standard home insurance doesn’t cover agricultural buildings and livestock, so it’s unlikely to be suitable – even if a farmhouse is on a farm that’s no longer in operation. Compare the Market doesn’t offer a comparison for farmhouse insurance, but there are many reputable specialist providers to choose from.
Your farmhouse is part of your business, so you’ll need specialist farm insurance for it. This is often packaged with business insurance, like employers’ liability and loss of revenue cover, as well as cover for farm buildings, including the structure and contents of your home.