The Observer Common sense and Equity unemployment statistics prove acting is a madly competitive business. Yet the way actors tell it, this same profession breeds nothing but solidarity, tolerance and mutual admiration among its members. Only occasionally does someone break rank. In a letter to the London magazine Time Out last October, replying to comments made in an interview by Helena Bonham Carter, the actress Kathy Burke wrote: ‘As a lifelong member of the non-pretty working classes, I would like to say to Helena Bonham Carter (wholly pledged member of the very pretty upper-middle classes): shut up you stupid c-.’ But The Observer has enough scruples about printing the f-word, let alone the c-word.…