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Theresa May should “show a bit more of her sense of humour”, the leader of the Scottish Conservatives has said as the UK polling gap with Labour narrowed yet again.

One piece of research by Survation for The Mail on Sunday put the two main parties virtually neck and neck with the Tories on 40% and Labour on 39%.

However the findings contrast sharply with a ComRes poll for the Independent and Sunday Mirror which still shows the Conservatives with a healthy 12 point advantage.

Others put the gap between the two main parties at between four and 11 points, with the other smaller parties apparently stalled.

In an interview for the Sunday Times magazine, Ruth Davidson said of the Prime Minister: “I get on very well with her.

“I really respect her and I respect the fact that she knows exactly how hard the job is that she’s about to do.”

She added: “Sometimes I wish she would show a bit more of her sense of humour and stuff to the public.

“She’s a really dry wit. Genuinely a very, very funny woman.”

Meanwhile, another new poll suggests that Scottish Labour is enjoying a last minute general election surge in support.

Research by Survation for the Sunday Post found that once undecided voters were stripped out Kezia Dugdale’s party is on 25%, up eight points from a similar poll on April 23.

The SNP is on 40% (down three points) while the Tories are backed by 27% (down one point) and the Lib Dems 6% (down three points).

On the issue of tactical voting, 44% of respondents to the Post’s poll said they would consider voting for a party or candidate that is not their first choice in order to stop a party or candidate they do not like from winning. Almost a third, 34%, said No and 22% were not sure.

Scottish Labour General Election campaign manager James Kelly said: “In seats such as Edinburgh South, East Lothian, East Renfrewshire, Lanark and Hamilton East, Coatbridge, Chryston and Bellshill, Midlothian and Kirkcaldy and Cowdenbeath, only Labour can beat the SNP – the Tories aren’t at the races here.”

Angus Robertson, the SNP’s depute leader, said: “This poll shows that only the SNP is strong enough to beat the Tories in this election, and with polls narrowing across the UK, the result in Scotland may well determine the size of Theresa May’s majority.”

A Scottish Conservatives spokesman said: “This poll shows us up massively from the last general election, and that we’re receiving the backing of voters right across Scotland.”