Lottery operator Camelot says that the £64 million win would be the largest ever to go unclaimed.
Hertfordshire residents are being urged to check their pockets, cars and sofas for the missing ticket.
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The 33 year-old victim was cycling to the shops when he was the victim of the unprovoked attack by three men.
A Liberal Democrat parliamentary candidate has said he deliberately caught HIV after years battling depression.
His top speed is believed to be the highest ever recorded in the UK by a rider carrying a pillion passenger.