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
Greenwich Time Signal pips were of equal length and confusion arose as to which was the final pip, hence the last pip was of extended length. The pips are available to BBC radio stations every 15 minutes but except in rare cases, they are only broadcast on the hour, usually before news bulletins or news programmes. On BBC Radio 4, the pips are broadcast every hour except at 18:00 and 00:00 and at 22:00 on Sundays (at the start of the Westminster Hour) when they are replaced by the Westminster chimes of Big Ben at the Palace of Westminster. No time signal is