The pair have not confirmed whether or not the reports are correct. However, if the story is true, the Bulls join a number of couples whose lottery win has cost them their marriage.
Most famously, Adrian and Gillian Bayford, who won £148 million in 2012, split up 15 months later, citing the pressure of their win as part of the reason. And the bad feeling didn't end there, with Gillian later telling the papers that she'd fallen out with her family too.
Les and Samantha Scadding, who won £45.5 million in 2009, lasted rather longer, but split up in 2013. And, similarly, Michael Carroll - who called himself the 'King of Chavs' after winning £9.7 million on the lottery in 2002, also ended up splitting up with his wife.
Back in 1995, Mark Gardiner won £11.3 million in 1995 and split with his fourth wife over the pressure - although he did later find happiness after getting back together with his first wife.
And winners will generally find that a split costs them dear. Last year, for example, a Chinese man won £463,890 on the lottery and immediately decided to divorce his wife - without telling her about the win. She found out, and won half the cash in court.
Even harder hit was Denise Rossi, who won $1.3 million in the California Lottery in 1996. Again without telling her husband, she filed for divorce just days later.
However, a judge ruled that she had committed fraud, and she was ordered to hand over every penny of her win to her ex-husband.
Biggest UK lottery winners
Biggest UK lottery winners
Colin and Chris Weir, from Largs in Ayrshire scooped 161 million in the EuroMillions draw after several rollovers in 2011. They are the biggest British lottery winners in history.
Adrian Bayford, who won an astonishing £148m on the Euromillions with his wife Gillian, had to shut up the music shop he owns, because people targeted it with requests for money.
One British ticket won £113,019,926 in October 2010 but decided not to go public.
Car mechanic and racing driver Neil Trotter scooped a staggering £107.9 million jackpot on the Euromillions lottery in March 2014.
Dave and Angela Dawes won £101 million on the EuroMillions in 2011. It was only the third time the couple, from Wisbech, Cambridgeshire, had played the lottery. The couple are said to have since split up.
The sum was won in May 2010 but the winner kept their identity a secret.
One lucky British ticket-holder picked up a £81million EuroMillions rollover but remained anonymous.
Nigel Page and Justine Laycock from Cirencester bagged a £56 million jackpot back in February 2011. On winning the jackpot, Page said: 'I'd already checked my National Lottery account and had seen I'd won £55 on Lotto when I decided to buy two Lucky Dips for the big EuroMillions jackpot on Friday.'
One lucky winner won shy of 50 million but chose to remain anonymous.
Les and Sam Scadding from Newport, South Wales, and a syndicate of seven Liverpudlian call-centre workers shared a staggering £91 million in November 2009. Les, an unemployed mechanic, was £68 overdrawn on the day he bought his ticket, while the Liverpool syndicate only started playing EuroMillions together four months before their win.
Carrington, 22, from Stapleford in Nottingham, banked £45 million after matching all five numbers and two Lucky Stars in a EuroMillions draw in February 2012. The Iceland supervisor said she planned to marry painter fiancee Matt Topham, 22, following the Lucky Dip win.
Husband and wife Gareth and Catherine Bull have fairly modest spending plans despite their £40.6 million jackpot win in January. Speaking about what she planned to do now that she was rich, Catherine explained that she intended to use part of their winnings to replace the carpet on her upstairs landing...
Angela Kelly became one of the biggest lottery winners in UK history back in 2007, after scooping a £35 million EuroMillions jackpot. This is estimated to earn £5,000 a day in interest alone, meaning she's unlikely to ever be short of cash.
In June 2009, 74-year-old Brian Caswell got the surprise of his life when he took his lottery ticket to his local newsagent and discovered he'd won almost £25 million.
Belfast housewife Iris Jeffrey, 58, was the lucky holder of the record 20.1 million rollover lottery winning ticket back in 2004.
Jeffrey, 58, a cancer sufferer, only realised three weeks after the draw took place that she had won the jackpot after organisers Camelot pleaded for the person holding the prize ticket to come forward and claim the prize.
Stephen Smith and his wife Ida from Hemel Hempstead, Herts, won nearly 19 million in the National Lottery. Mr Smith said he would give up his winnings if he could have his health and the chance to live a longer life with his wife.