PRO-Republic campaigners have pledged to "bring down the monarchy" after new polling revealed a drop in support.
The British Social Attitudes (BSA) survey, published by the National Centre for Social Research, found that support for the abolition of the monarchy has grown to 38%.
This is compared with 51% of people who said they were in favour of the monarchy.
The findings from the BSA considered how the public's views towards the monarchy have shifted over the past four decades.
The BSA said support for the monarchy has been in decline over the last decade in particular. In 2012, around 76% of people said they believed having the monarchy was "very" or "quite" important. In 2023, this figure fell to just 54%.
Campaign group Republic said the polling suggests a "it's all to play for".
It comes after a Savanta poll – commissioned by Republic last year –found that support for the monarchy fell below 50% for the first time.
Republic said "the monarchy has never looked so vulnerable", adding that it is "a matter of when, not if the monarchy is abolished".
Republic CEO Graham Smith said: "The royals have no cards left to play. They increasingly look like out of touch celebrities, tax-funded Kardashians.
"If they cling on to their tax breaks, secrecy and wealth they'll be turfed out sooner than might be expected."
Smith said that the number of people in support of the royal family is "rapidly diminishing" and largely limited to people over 65, adding that "most people simply don't care about the monarchy" because it is not "relevant to their every day concerns and is at odds with most people's values".
"The monarchy has been rocked by scandal and they have lost their first line of defence, the late queen," Smith continued.
"Meanwhile the anti-monarchy campaign continues to challenge the institution, the myths and costly parades."
Smith added: "The monarchy is corrupt, secretive and completely out of step with British values. It is clearly time it went."
"It's all to play for, the monarchy has never looked so vulnerable and I believe it's a matter of when, not if the monarchy is abolished."