According to Bassett, the precise disclosure wager is that, "Within the next year the UK prime minister will officially confirm non-human beings of extraterrestrial origin - not from Earth - are flying craft in Earth's skies."
"A pay out to PRG on the wager mentioned would, of course, go toward PRG's post-Disclosure advocacy work," he added.
"The last bet was 100/1 but we are now just 25/1 and will be offering maximum bets of £50 [$65]," a William Hill spokesperson said.
"Over the years we have had many bets for aliens but this is the first time that we have been worried."
The Inquisitr reported in January that Clinton made the promise during an interview with the Conway Daily Sun while campaigning in New Hampshire.
She told the newspaper she believes Earth may have been visited by extraterrestrial beings and that she would set up a task force to investigate claims that alien technology is being kept at Area 51 secret base in the Nevada desert.
"We are going to get disclosure this year," Bassett told Express. "I am not sure who will win the election, but I think Obama will be the disclosure president."
"He [Obama] will be looking at a Nobel Prize for making an announcement like that."
And as part of efforts to increase awareness about ongoing efforts to force world governments to make full UFO/ET disclosure, advocates celebrated World Disclosure Day on July 8. It came soon after the Canadian National Inquiry into UFOs was held at the Alien Cosmic Expo in Brantford, Ontario, on Saturday, June 25.
Bassett, reportedly the only registered UFO lobbyist in the U.S., addressed attendees at the Alien Cosmic Expo, pointing out that the World Disclosure Day event was not meant as a prediction that disclosure would happen on July 8. It was meant only to draw attention to the ongoing campaign for disclosure.
Basset criticized the official secrecy surrounding the issue of UFOs. He argued that while governments have the right to keep secrets they do not have the right to lie to the people.
"In a constitutional democracy, the government has always been given the right to keep secrets, but the government has never been given the right to lie to the people," he said.
According to UFO disclosure advocates, world governments imposed a "truth embargo" to withhold vital information about contact with alien races early in the last century. It is believed widely in UFO disclosure circles that governments agreed to the "truth embargo" soon after 1947 when an alien spacecraft allegedly crashed at a ranch near Roswell in New Mexico, according to the Inquisitr.
The Inquisitr also reported last month that Victor Viggiani, a Canadian disclosure advocate, dared the U.S. government to charge him after releasing to the public secret North American Aerospace Defense Command (NORAD) UFO files he obtained through a Canadian Access of Information Act (AIA) request.
The 11 files revealed that in the last five years NORAD tracked on the average about 1,800 UFOs with 75 intercepts per year.