14:00Ladies of LettersLadies of Letters Go GreenEpisode 3BBC Radio 4 Extra Duration: 15 minutes Wed 22nd Jun 2011, 14:00 on BBC Radio 4 ExtraIrene's son has a surprise for his mother and the police pay Vera a visit. With Prunella Scales and Patricia Routledge.GenresComedySitcomsBrandLadies of LettersSeriesLadies of Letters: Ladies of Letters Go Green Source: BBC Online