A computer glitch which halted thousands of lottery ticket sales this weekend has cost the winner £800,000.
The winning punter will pocket £3.4 million rather than the £4.2 million previously estimated because of the lost sales.
Camelot apologised after the problem which left players around the country unable to buy tickets from shops and the internet on Saturday afternoon.
At the beginning of the National Lottery draw show on BBC1, host Carole Machin apologised to viewers.
She said: "Due to a network communication issue this afternoon players may have experienced difficulties buying national lottery tickets in store or via the National Lottery website.
"We would like to apologise to anyone affected."
Camelot said the "network communications issue" had resulted in either slower than normal transactions or retailers being unable to perform transactions at all.
Ticket machines across the country were up and running again at full speed after 6pm, the organiser added.
On Christmas Eve, lottery organisers estimated Saturday's jackpot at £4.2 million, but the winning total turned out to be £3.4 million.
