London attack: Theresa May says 'things need to change'This video can not be playedTo play this video you need to enable JavaScript in your browser.London attack: Theresa May says 'things need to change'CloseThe prime minister says the UK must adapt to a "new trend" in terrorism.Published4 June 2017SectionBBC NewsSubsectionUKShareclose panelShare pageCopy linkAbout sharingRead description