Greenwich Time Signal a station jingle during Jakki Brambles' early show and Simon Mayo's breakfast show. This was not strictly crashing the pips as they were not intended to be, or mistaken for, an accurate time signal. At 8 am on 17 September 2008, to the surprise of John Humphrys, the day's main presenter on the "Today" programme, and Johnnie Walker, who was standing in for Terry Wogan on Radio 2, the pips went adrift by 6 seconds, and broadcast seven pips rather than six. This was traced to a problem with the pip generator, which was 'repaired' by switching it off and
BBC Radio 4 meant that newsreaders can provide cover for continuity, which regularly occurs at 23:00 each night and 16:00 on a Sunday. This has reduced the total number of continuity announcers required each day down from four to three. The Time Signal, known as 'the pips', is broadcast every hour to herald the news bulletin, except at midnight and 18:00, where the chimes of Big Ben are played. There is no Greenwich Time Signal during the Saturday Afternoon Drama at 15:00 on Radio 4 on Saturdays either. Only pips broadcast on FM/AM/MW/LW are accurate. On all digital platforms they are in delay