Alan Bennett: 'I don't fret about posterity. But some things will last'
The beloved writer's work will be the centrepiece of BBC2's Christmas Eve. Now 82, he talks about trying not to be an old git and waging war on squirrels'I'm afraid I really haven't got much left to say," is Alan Bennett's opening gambit. "I have such a limited repertoire." This, from a writer who recently published a chunky new volume of prose, and is about to be the subject of a new documentary, is frankly a tease.…