On Thursday, following the Tories release of their manifesto, the Labour party were cut to 12/1.
The Conservatives are facing claims of a U-turn over their plan to reform the way social care is funded after Theresa May said the government would consult on the maximum amount anyone should have to pay.
"Labour has also bought an ad on Google entitled 'Tory Dementia Tax - What You Need to Know", which links through to the party's website.
Described over the weekend by the Labour leader Jeremy Corbyn and Alzheimer's Society chief executive Jeremy Hughes as a "dementia tax", Mrs May, defended her party's social care pledges, with the words: "Since my manifesto was published, the proposals have been subject to fake claims made by Jeremy Corbyn". The only things he has left to offer in this campaign are fake claims, fear and scaremongering, ' she said.
Answering questions before Mrs May confirmed her plans, Mr Corbyn said: "A Tory U-turn on social care would be extremely welcome because I want this country to face up to its responsibilities to those who need care, like the frail and elderly, those with special needs, those with severe disabilities, those with learning difficulties".
"The move came in response to growing criticism of May and her party's manifesto commitments, with the Tories likely to have spent thousands of pounds on placing their advertisement in Google's primary spot.Now the top result for "dementia tax" is occupied by the Conservatives" headline and link to their website.
She told reporters: "We have not changed the principles of the policies we set out in our manifesto".
She insisted that "nothing has changed" regarding the substance of the proposals.
He said: 'The extent of the Labour rise, and Conservative fall, are rather greater in Wales, and are sufficient to put Labour back into a significant lead in Wales'.
Mrs May's climbdown came after a clutch of opinion polls showed Labour eating into her party's lead.
May called the election to strengthen her hand in negotiations on Britain's departure from the European Union and win more time to deal with the impact of the divorce.
Speaking at the launch of the Welsh Conservative manifesto, Mrs May disclosed details of the cap, although she did not say what amount the upper limit would be - only that it would be part of a consultation.
Former Hull MP and deputy prime minister Lord Prescott was today campaigning with Jeremy Corbyn as the Labour leader visited the city and Scarborough.
Steven Cameron, pensions director at Aegon, said the "pressing crisis" in social care funding can only be solved through a "clear, fair and long lasting agreement" on what the state provides and what individuals will be expected to pay.
Under the current law, the expenses of people living in residential care are met by local authorities and recovered from the sale of the family assets after death.
And Ukip economic spokesman Patrick O'Flynn said the new policy was "wholly inadequate" and Tories were in "full meltdown" on the issue.
May said she believes the decision shows that she is prepared to take hard decisions. "Nobody mentioned a cap because there wasn't going to be one".