Completing financial form - house valuation question

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Completing a D81 form and need to write down the property value. We had the house remortgaged in May 2023 so I have a valuation from then (by the bank, not estate agent).
Do I put this value down or is it too out of date? Also, isn't the bank valuation always lower than market value?
Should I put down what we think we'd sell the house for, which would be about £50k more than the official valuation?
Thank you!

It is what it's valued at the time of form filling, and is based on what it will fetch on an open market. They expect you to get three EA to value it and you take the middle one if they are similar in price.