Peel's session sheets between 1967 and 1996 are held at the centre, along with Peel's production wallcharts, planners, diaries, files, notes and recollections. The source of the majority of Ken Garner's Peel's sessionography mentioned in his Peel Sessions book come from the BBC Written Archives Centre. In the book, Garner mentions PASB's are generally very reliable, but not perfect, because sometimes when they were microfilmed, shows or pages were missing, or strips of paper for individual musical items were accidentally overlaid on others on the camera platen, obscuring some parts of the show. He also mentioned that session sheets were good, but very often the broadcast date was not on them, because they were decided on a later date.