Tory slump means Corbyn “could gain 30 MPs” and force a hung parliament

Labour could gain nearly 30 seats and force a series of key losses on Theresa May to leave Britain with a hung parliament, a new poll reveals.

Jeremy Corbyn could add around 28 MPs to Labour’s current total of 229 and deprive the Tories of an overall majority, according to a shock survey published today.

May’s party would fall back from 330 seats at the time parliament was dissolved to 310, well short of overall majority.

If the projection – carried out by YouGov for The Times – was to be replicated on June 8 then it would raise the prospect of another Tory-Lib Dem coalition.

The poll was carried out after May’s humiliation over manifesto plans for a “dementia tax” which prompted a revolt by her MPs and candidates in marginals and then, ultimately, a u-turn.

It is the first constituency-by-constituency estimate of the election result to be carried out by YouGov.

YouGov projects for The Times (actual number of seats at the time of dissolution)

Conservative: 310 seats (330).

Labour: 257 (229)

SNP: 50 (54)

NI: 18 (18)

Lib Dems: 10 (9)

Plaid Cymru: 3 (3)

Greens: 1 (1)

Other: 1 (1)

UKIP: 0 (1)