Kids' jigsaw puzzles PM and Boris
David Cameron and Boris Johnson were left scratching their heads over a jigsaw puzzle designed for young children as they visited a nursery.
Hitting the General Election campaign trail together for the first time, the Prime Minister and Mayor of London took on the tough task at the Advantage day nursery in Surbiton, south west London.
Sitting with Joshua and Stephanie, both aged three, and four-year-olds Hamish and Leo, they first broke up the puzzle, which depicted the four seasons, and then tried to reassemble it.
But that proved more difficult than expected, with Mr Johnson soon questioning whether there was a fundamental design fault.
"January is in winter," he complained. "There's something wrong with the puzzle."
As the minutes passed and with the cameras rolling, Mr Cameron reassured himself that "We've got all day".
"We can't be beaten by the puzzle," the Mayor growled.
Hamish asked Mr Cameron why the room was still full of journalists.
"If we finish the puzzle it will make them go away," the PM said.
"I've found another problem," said Leo woefully.
At one point Mr Johnson hammered a piece into place with his fist.
"If in doubt, wedge it in," Mr Cameron said approvingly.
But, apparently concerned that they were not making much progress, a teacher then stepped in.
"This one is not right," she said. "This one goes there."
As the last piece went in to cheers - nearly nine minutes after they began - Mr Cameron initiated a group hug.
"Thank God for that. That was stressful," he said. "I do have to have a hug after that."
Mr Johnson joked: "That was a bit like the (election) campaign ... suddenly, the final surge."
"It all comes together in the end," said Mr Cameron, before stopping one of the children taking the puzzle to pieces.
"Don't break it up again - I can't take the stress."
Afterwards the two men joined another group of children for a hand painting session - appropriately using blue paint.
The Tories, who have pledged to double free childcare provision for three and four year-olds to 30 hours a week, are trying to oust Liberal Democrat former energy secretary Ed Davey from the Kingston and Surbiton seat.