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Labour was dealt a heavy blow today with an exclusive poll revealing Jeremy Corbyn’s key leadership ratings have plunged in his first year as leader.

His ratings have sunk for being a “capable leader” and having “lots of personality”, while fewer than one in five think he would be “good in a crisis”, the Ipsos MORI research reveals.

Fewer than a quarter of voters (24 per cent) think he is a capable leader, compared with 68 per cent who say the same of Theresa May.

Damningly, more Labour supporters see the Tory leader as capable (58 per cent) compared with him (46 per cent) and fewer than half are satisfied with his performance.

Labour is set to announce the results of its leadership election on September 24, with Mr Corbyn expected to comfortably see off challenger Owen Smith.

Among the general public, Mr Corbyn is trounced by Mrs May on most key ratings, including sound judgment, vision, understanding Britain’s problems and being patriotic.

He is still ahead for being seen as “more honest than most politicians” and his patriotism rating is up since last September.

The research confirms Mrs May is enjoying a honeymoon with voters. If a snap election were held, the Tories would win with 40 per cent, six points ahead of Labour’s 34. Ukip are on nine per cent and the Lib-Dems are on six.

Three in five people say they “like” Mrs May. She is more popular than her party, which is liked by just 38 per cent.

Mr Corbyn is liked by 37 per cent of the public and a majority of 54 per cent dislike him.

He is less popular than his party, which is liked by nearly half.

On the key issue of immigration, widely thought to have swung the EU referendum, Mrs May is far more trusted than the Opposition leader.

A majority of 57 per cent have a great deal or a fair amount of trust in her to make the right decisions for the country, while 31 per cent say the same of Mr Corbyn.

Eight in 10 Conservative supporters are satisfied with Mrs May’s performance as Prime Minister. Among the general public, her satisfaction score is exactly twice Mr Corbyn’s, at 54 to 27.

Gideon Skinner, head of political research at Ipsos MORI, said: “Theresa May’s honeymoon continues for now — she is more liked than David Cameron ever scored.

But for Labour it’s the opposite, and will raise worries about the softness of their vote. One in four say they like the party but not the leader, including three in 10 Labour supporters.”