Unveiled in 1989 to celebrate Blackpool Opera House's centenary, the Roll of Honour board situated inside the Winter Gardens Church Street entrance is a who's who of British showbusiness. A single word per entertainer sums up the calibre of performers over the years: Chaplin, Formby, Bassey, Forsyth and Cilla.   Occasionally an entire production gets to dominate a particular year on the board, such as 2009's Royal Variety Performance and 2011's Calendar Girls. Speaking of Calendar Girls, its famous "considerably bigger buns" line is now relevant for the Winter Gardens, as they need a considerably bigger yearly legends board following one final addition.   …