Hi Ketan,
You can charge a finders fee to the buyer and just sell on the property at the same price... they'll see your value based on the fact it's off market and also a great price - you've clearly added value!
You could also act for the seller and take a fee from them. So if they agreed to sell for a slightly higher price to include your fee and then pay you once the sale completes, that's the normal way agents get paid in the U.K. And all estate agents get paid by the seller...
The deal should be secured with an agency agreement from the seller or a buyer's agent / finders fee / NDA with the buyer. The later is harder to enforce if they choose not to pay but be aware that no contract is perfect if you're dealing with dis honest people so just be sure you know who you're dealing with as well.
Hope this helps
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