This question can reveal whether you're walking into a good deal or about to overpay. If the property was valued significantly higher or lower recently, you want to know why.
Ask if they've had any recent valuations or if the asking price has been reduced since going on the market. A price drop might mean they were being unrealistic initially, or it could signal underlying issues that other buyers spotted.
You can also check online property portals to see the price history yourself. Check the Land Registry sold prices and Zoopla to get prices for that specific property, and the local area.
You can also see here how often and many owners the property has had, short stints might signify an underlying issue with the property or the area.