A staggering £136m is up for grabs in tomorrow’s [Friday] National Lottery EuroMillions draw, promising “a sales frenzy” at convenience stores, Camelot UK Lotteries, the licensed operator, has claimed.

It follows the EuroMillions September 15 draw, in which no one won the £115m that was up for grabs – itself one of the biggest jackpots Camelot has ever organised.

Camelot predicted retail sales would be 146% higher than for a normal EuroMillions draw, in what will be the biggest jackpot of the year.

Camelot said it was spending 50% more than usual to promote the draw, including television, radio, press and retail posters and media screens.

Retailers should let all their customers know about the jackpot and make the most of National Lottery players coming back to check their tickets after the draw, it said.

A spokeswoman said the jackpot would be even bigger on Tuesday, if it was not won on Friday – “giving retailers yet another opportunity to boost their bottom lines”.

Meanwhile, a special draw on October 13 will guarantee 13 UK millionaires.