Sir Keir Starmer's plunging popularity has crashed even further at rapid speed to its worst-ever rating, revealing the scale of the crisis engulfing . The Labour leader briefly had a positive net favourability after his party's , where it won a mammoth 174-seat majority.

But the polls have been downhill since then, with Sir Keir's personal ratings steadily collapsing amid a series of scandals and controversial policies, such as . Despite a brief revival in his popularity following international crises and , the PM's net favourability has now slumped to -46% - his worst-ever rating. The YouGov survey showed Sir Keir's approval rating slid by 12 percentage points in a month after Labour lost hundreds of councillors in a .

The party lost badly to Nigel Farage's insurgent Reform UK, which won two mayoralties and - where it overturned Labour's 14,696 majority.

Perhaps most worrying for the Government in the YouGov poll conducted on May 13-14 was the fall in support for Sir Keir among Labour voters.

YouGov said the "fall in Starmer's popularity is concentrated among Labour voters, half of whom (50%) now have an unfavourable view of the prime minister, a 17-point increase from mid-April".

It added: "The proportion with a favourable opinion has correspondingly fallen from 62% to 45% over the last month.

"This is the first time Keir Starmer has recorded a net negative approval rating among Labour voters."

Sir Keir's policies have caused uproar among Labour ranks, with senior figures such as former frontbenchers Diane Abbott and Ed Balls criticising .

The Labour leader has also been criticised by figures in his own party for cutting international aid and .

Little more than one in five (23%) voters now have a positive view of the PM, with YouGov saying his current ratings equal his nadir as opposition leader in July 2021.

Back then, Sir Keir struggled as then-prime minister Boris Johnson rode a wave of popularity after the Covid vaccine rollout and , one of its previously safest seats.

over the past month, with the Reform UK leader scoring his highest-ever net favourability rating in the poll.

However, six in 10 Brits still view him unfavourably, with a net score of -27% - up from -38% in April.

YouGov added that " continues to get less popular as her leadership progresses", with just one in six (16%) viewing her positively. Her net rating is -39%.