class="Typography_base__k7c9F FixedHeader_desktopPrimaryContext__TOpED Typography_sizeMobile16__Wygfe Typography_lineHeightMobile24__xwyV0 Typography_regular__Aqp4p Typography_colourInherit__xnbjy" data-component="Text">Millions of people across the UK heard an alarm on their phones on Sunday afternoon, local time, while many others did not. "A spokesperson for the UK'S Cabinet Office told BBC it was aware some people hadn't received the alert and would "be looking at this as part of our review of the test". "In a real emergency, follow the instructions in the alert to keep you and others safe