Usually not. Some very elderly people are grandfathered in under a previous regime where it was allowable. If you're healthy and young, no.
You do get lots of child benefits if you have kids. And you get free healthcare. College/University costs just £3,000 per year instead of $15,000+. They pay merit scholars to get advanced degrees (about 1/4 of advanced degree students at the prestigious schools are paid a decent living wage to stay in school). And they have jolly nice museums and parks, all paid for with your tax money. But no, no deductions for your stay-at-home spouse.