Are UK pension overpayments recoverable where the pension scheme itself calculated and confirmed the amount? (opens in new tab)

I am trying to understand how UK law treats pension overpayments where the recipient had no obvious way of knowing they were being overpaid. In the questioner asks about repaying a dividend that is accidentally paid twice. In this instance, it seems clear that the recipient of the mistaken payment is aware of the mistaken payment and should repay it. Section 5(4) of The Theft Act 1968 was quoted in an answer to that question: Where a person gets property by another’s mistake, and is under an ...