The winner of a £33m Lotto prize still remains a mystery, Camelot has confirmed.

If the money stays unclaimed this week, the National Lottery organiser is expected to release details of where the ticket was bought.

It has been more than a week since Lotto ticket holders crossed their fingers for Britain's biggest-ever Lotto jackpot - the result of 14 rollovers.

Just two winners shared the £66m fortune, with David and Carol Martin, both 54, from Hawick in the Scottish Borders, immediately claiming their half of the jackpot.

But their fellow prize-winners have yet to lodge a claim for their life-changing prize.

A Camelot spokeswoman said: "We've had people come forward in the second week - that's not uncommon - but we have no update as yet."

Rumours have spread that the winning ticket was bought at a Morrisons in Bolton, The Bolton News reported.

A plaque that says "millionaire created here" arrived at the town's Blackhorse Street branch on Monday, the paper reported, with Camelot only confirming it referred to a winner in the store in the past six months.

And Mark King, a Waitrose store manager from Chorley, told the paper: "My friend works at the Morrisons store and he was sent an email from Camelot on Monday morning saying that the ticket that’s unclaimed was from their shop."

Last week a Camelot spokesman said it was "highly unusual" that no one had come forward following the level of hype and excitement around this particular draw.

Camelot will release information about where the ticket was bought within 25 days of the draw, in an effort to jog people's memories.

The winner has 180 days from the date of the draw to claim the prize, which will go to National Lottery projects if it remains unclaimed.