BUZZ-Daily Mail: worst day in 6 yrs as warns of weaker ad markets
** Daily Mail bottom of the Stoxx & poised for biggest one-day drop since April 2009
** Co sees "marked deterioration" in British print advertising market meaning FY to be at lower end of expectations
** Stock down 8.1% at levels not seen since mid March in volume at a fifth of 90-day daily avg after just 15 mins of trade
** DMGT join rivals Trinity Mirror (LSE: TNI.L - news) & Johnston Press in warning of weaker ad markets (RM (LSE: RM.L - news) : tricia.wright1.thomsonreuters.com@reuters.net)