Tory leadership hopeful Esther McVey has come under fire from within her own party after she said it should be up to parents if they want to withdraw their primary-age children from lessons on same-sex relationships. The remarks by McVey, a former work and pensions secretary, sparked a backlash from equality campaigners and one of her own colleagues, Justine Greening, who was the first openly gay female cabinet minister. McVey told Sky News: “I believe parents know best for their…