Tax Policy Associates added the clause in February as an experiment, to see if anyone would actually read the full terms.
The non-profit organisation's head Dan Neidle shared the story in a tweet on X, formerly Twitter, saying the first person to spot it would get sent a "bottle of good wine".
Mr Neidle – who has previously reported on high-profile tax cases, including that of former Chancellor Nadhim Zahawi – told the BBC it was his idea to add the wine offer.
The business has recently changed the small print on its site after the eagle-eyed discovery.
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