Around 6pm last Christmas Eve, as shops closed, friends piled into busy pubs for pints, and commuters departed the city for the suburbs and beyond leaving behind locked, unlit offices, one of Ireland’s best-known defamation lawyers, Paul Tweed, took to Twitter to fire a shot across the bow at UK television presenter Dr Christian Jessen. “I am putting Dr Christian Jessen on notice in relation to a totally false allegation he has tweeted regarding DUP Leader and former NI First Minister, Arlene Foster. Legal action will also be taken against any persons who have retweeted this highly defamatory allegation,” the…