Brendan O’Carroll’s hammy Irish Mammy, Agnes Brown, has made the Dublin comedian famous and wealthy – and widely detested by comedy purists/snobs (delete according to perspective). This festive period, as fans look forward to the latest Mrs Brown’s Boys Christmas special – and the rest of the world trembles in horror – O’Carroll may well spare a thought for his own mother, Maureen. Christmas, after all, is a time for looking back and reflecting on those who have shaped us. And few will have had