WHO does not have the power to ban vaping nor has it explicitly praised the 32 countries that have banned vaping.
WHO doesn't have the power to ban vaping in the U.K. or indeed in any other country. It also hasn't explicitly praised the 32 countries that have banned vaping.
WHO has, however, expressed concerns about e-cigarettes and vapes, which it calls "electronic nicotine delivery systems." It also stated that the electronic delivery system market is unregulated in many parts of the world. In its report on the "global tobacco epidemic 2021," WHO said that electronic nicotine delivery systems "should be strictly regulated for maximum protection of public health." Nowhere does the report advocate for a blanket ban on vaping.
In a news article published on its website back in July, WHO writes that "these products are often marketed to children and adolescents [...] WHO is concerned that children who use these products are up to three times more likely to use tobacco products in the future."
Public Health England doesn't seem to advocate for a vaping ban either. In a summary of its 2021 report, it says that "alternative nicotine delivery devices, such as nicotine vaping products, could play a crucial role in reducing the enormous health burden caused by cigarette smoking."