Original sentence: On Radio 4, the pips are replaced at the start of the 6pm and midnight news bulletins (and on Sundays at 10pm) by the Westminster chimes from the Clock Tower at the Palace of Westminster, with the hour chimes of Big Ben, sometimes called the "bongs" (though these are more associated in the common mind with ITV's News at Ten)
Edited sentence: On Radio 4, the pips are replaced at the start of the 6pm and midnight news bulletins (and on Sundays at 10pm) by the Westminster chimes from the Clock Tower at the Palace of Westminster, with the hour chimes of Big Ben, sometimes called the "bongs" (though these are more associated in the popular mind with ITV's News at Ten)