The winner of a EuroMillions lottery ticket worth £63.8m failed to claim their prize in time, meaning the winnings and their accrued interest have been shifted into the National Lottery's good causes pot.

Camelot, operator of the National Lottery, ran an unsuccessful campaign to find the winner of the 8 June 2012 EuroMillions draw utilising social media and the press, and advertising in the Stevenage and Hitchin area where the ticket was purchased.

A spokesperson for the National Lottery said: 

“We tried very hard to find the ticket-holder, with lots of awareness-raising activity over the past 180 days, and it’s a real shame that they have missed out, but there is still one winner – the nation.

"This money, and all the interest earned over the 180 days, will now go to the National Lottery Good Causes – adding to the £29bn already raised and distributed to over 390,000 individual awards that have benefitted people, communities and projects across the UK.”

All prizes unclaimed within 180 days go towards good causes. Other unclaimed prizes include a £1m EuroMillions raffle prize purchased in the Stratford-upon-Avon District and a £3.6m Lotto draw prize from the Lanarkshire Area, both from November.

The National Lottery raises over £30m for good causes every week from ticket sales and an average 125 lottery grants for every postcode district in the UK have been made since its launch in 1994.