Can someone explain a mortgage retention in this situation please?

We're buying a house for £50k and borrowing £25k of that and paying the rest form savings. A mortgage survey has seen a £2k retention put on the mortgage for damp. If we cough up the extra money (£2k retention) to buy the house and never have the work done to release the retention, are we effectively out of pocket £2k or will we get it back once the mortgage is repaid in full?

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