Four in 10 Britons worried, angry about Brexit: survey The Mental Health Foundation (MHF) charity releases a survey to look at the impact of Brexit on how people felt, their sleep and their relationships. The poll found that Brexit had made 43 percent feel powerless, 39 percent feel angry and 38 percent feel worried while 7 percent said it had caused them "high levels of stress" and 12 percent reported that it had caused them sleeping problems. IMAGES AND SOUNDBITES of interview with CEO of the UK Mental Health Foundation